Born in Bradford Data Dictionary

Maternity records BiB pregnancy

Table ID: BiB_Pregnancy.matrecs_bib_preg

github | csv

Entity type Variables Entities Updated Related tables
Participant 143 10041 2022-11-02 matrecs_bib_admiss
matrecs_bib_labbp
matrecs_bib_meds
matrecs_bib_oedema
matrecs_bib_postbp
matrecs_bib_pregbp
matrecs_bib_proteinuria

Abstraction of routine information from maternal paper records for the Born in Bradford cohort. The abstraction was funded by a NIHR HTA project (11-99-02). Four trained research assistants abstracted data from maternal paper records. The abstraction was conducted in 2013. Only women with completed baseline questionnaires, oral glucose tolerance test results and birth outcomes were eligible. Data were entered straight into a web database. Accuracy of abstractions were checked on 5% of records for all abstracted data, all error rates were less than 1%. This source contains information from the current BiB pregnancy.

variable label value_type summary
BiBPregNumber decimal mean (sd)
1.10 (0.30)

min < median < max
1.00 < 1.00 < 3.00

Complete: 10939 (100.00%)
has_matrecs_bib_preg Has maternity records bib pregnancy decimal mean (sd)
1.00 (0.00)

min < median < max
1.00 < 1.00 < 1.00

Complete: 10939 (100.00%)
has_prnprg Has: Pregnancy third trimester weight decimal 1 : has
Complete: 10939 (100.00%)
prnbp3rdtriw 3rd trimester weight decimal mean (sd)
77.45 (15.44)

min < median < max
32.00 < 75.00 < 160.00

Complete: 6213 (56.80%)
prnbp3rdtriwdate Date of 3rd trimester weighing date from 2006-12-15
to 2011-05-18

Complete: 6160 (56.31%)
prnbp3rdtriwnotdoc 3rd trimester weight not documented decimal 1 : Documented
2 : Not documented
Complete: 10934 (99.95%)
prnbpamnionoted Amniocentesis noted decimal 1 : No
2 : Yes
3 : Not documented
Complete: 10888 (99.53%)
prnbpamnioreasons Amniocentesis reasons text 12 unique values
264 non-missing values
1 to 38 characters
prnbpanaemianoted Anaemia noted decimal 1 : No
2 : Yes
3 : Not documented
Complete: 10911 (99.74%)
prnbpanaemiaresult Anaemia result decimal mean (sd)
9.13 (0.77)

min < median < max
4.50 < 9.40 < 9.90

Complete: 2518 (23.02%)
prnbpantibody Antibodies text 42 unique values
10897 non-missing values
2 to 27 characters
prnbpbplabn Number of BP obs in labour decimal mean (sd)
0.90 (0.41)

min < median < max
0.00 < 1.00 < 13.00

Complete: 9975 (91.19%)
prnbpbplabtaken Any BPs recorded in labour decimal 1 : No
2 : Yes
3 : Not documented
Complete: 10638 (97.25%)
prnbpbppostn Number of BPs recorded post partum decimal mean (sd)
3.50 (5.83)

min < median < max
0.00 < 2.00 < 155.00

Complete: 10664 (97.49%)
prnbpbppostrec Any BPs recorded postpartum decimal 1 : No
2 : Yes
3 : Not documented
Complete: 10921 (99.84%)
prnbpbppregn Number of BPs recorded in pregnancy decimal mean (sd)
10.98 (5.54)

min < median < max
0.00 < 10.00 < 115.00

Complete: 10926 (99.88%)
prnbpbppregrec Any blood pressures recorded in pregnancy decimal 1 : No
2 : Yes
3 : Not documented
Complete: 10932 (99.94%)
prnbpcervcerc Cervical Cerclage decimal 1 : No
2 : Yes
3 : Not documented
Complete: 10909 (99.73%)
prnbpchrovillsamp Chorionic villus sampling decimal 1 : No
2 : Yes
3 : Not documented
Complete: 10909 (99.73%)
prnbpchrovsreasons Reasons for chorionic villus sampling text 2 unique values
54 non-missing values
1 to 15 characters
prnbpconfetmon Continuous fetal monitoring decimal 1 : No
2 : Yes
3 : Not documented
Complete: 50 (0.46%)
prnbpdesigpsutur Designation of person doing suturing text 4 unique values
523 non-missing values
1 to 14 characters
prnbpdischinf Vaginal discharge/infection decimal 1 : No
2 : Yes
3 : Not documented
Complete: 10921 (99.84%)
prnbpdruglab1 Other drugs during labour (1) text 65 unique values
1483 non-missing values
1 to 18 characters
prnbpdruglab2 Other drugs during labour (2) text 48 unique values
374 non-missing values
1 to 18 characters
prnbpdruglab3 Other drugs during labour (3) text 44 unique values
237 non-missing values
1 to 18 characters
prnbpdruglab4 Other drugs during labour (4) text 29 unique values
125 non-missing values
1 to 20 characters
prnbpdruglab5 Other drugs during labour (5) text 16 unique values
82 non-missing values
1 to 15 characters
prnbpdruglab6 Other drugs during labour (6) text 12 unique values
74 non-missing values
1 to 18 characters
prnbpdruglab7 Other drugs during labour (7) text 5 unique values
56 non-missing values
1 to 15 characters
prnbpdruglab8 Other drugs during labour (8) text 2 unique values
54 non-missing values
1 to 14 characters
prnbpeclampconv Eclamptic convulsions decimal 1 : No
2 : Yes
3 : Not documented
Complete: 10928 (99.90%)
prnbpelectcaes Elective caesarean decimal 1 : No
2 : Yes
3 : Not documented
Complete: 10934 (99.95%)
prnbpexhyper Preexisting hypertension decimal 1 : No
2 : Yes
Complete: 10429 (95.34%)
prnbpextceph External cephallic version decimal 1 : No
2 : Yes
3 : Not documented
Complete: 10927 (99.89%)
prnbpfolicacid Folic acid in last 6 months decimal 1 : No
2 : Yes
3 : Not documented
Complete: 10909 (99.73%)
prnbpgdm GDM diagnosed decimal 1 : No
2 : Yes
3 : Not documented
Complete: 10921 (99.84%)
prnbpgdmt_diet GDM treatment: diet decimal 1 : No
2 : Yes
3 : Not documented
Complete: 482 (4.41%)
prnbpgdmt_insulin GDM treatment: insulin decimal 1 : No
2 : Yes
3 : Not documented
Complete: 580 (5.30%)
prnbpgdmt_lifestyle GDM treatment: lifestyle changes decimal 1 : No
2 : Yes
3 : Not documented
Complete: 331 (3.03%)
prnbpgdmt_metformin GDM treatment: metformin decimal 1 : No
2 : Yes
3 : Not documented
Complete: 50 (0.46%)
prnbpgdmt_none GDM no treatment decimal 1 : No
2 : Yes
3 : Not documented
Complete: 1663 (15.20%)
prnbpgdmt_notdoc GDM treatment not documented decimal 1 : Documented
2 : Not documented
Complete: 25 (0.23%)
prnbpgenherpes Genital herpes decimal 1 : No
2 : Yes
3 : Not documented
Complete: 10927 (99.89%)
prnbpgestaged3rdtriw Gestational age at 3rd trimester weight measurement (weeks) decimal mean (sd)
254.18 (18.84)

min < median < max
29.00 < 256.00 < 295.00

Complete: 6157 (56.28%)
prnbpgestagew3rdtriw Gestational age at 3rd trimester weight measurement (weeks) decimal mean (sd)
36.31 (2.69)

min < median < max
4.14 < 36.57 < 42.14

Complete: 6157 (56.28%)
prnbpgestht Gestational hypertension decimal 1 : No
2 : Yes
Complete: 10895 (99.60%)
prnbpgonorrhoea Gonorrhoea decimal 1 : No
2 : Yes
3 : Not documented
Complete: 10926 (99.88%)
prnbphdp HDP category decimal 1 : Normotensive
2 : Gestational HT
3 : Pre-eclampsia
Complete: 10895 (99.60%)
prnbphepatitisb Hepatitis b decimal 1 : No
2 : Yes
3 : Not documented
Complete: 10926 (99.88%)
prnbphyperemesis Hyperemesis decimal 1 : No
2 : Yes
3 : Not documented
Complete: 10928 (99.90%)
prnbpintfetmon Intermittent fetal monitoring decimal 1 : No
2 : Yes
3 : Not documented
Complete: 56 (0.51%)
prnbpivf In vitro fertilisation decimal 1 : No
2 : Yes
3 : Not documented
Complete: 10927 (99.89%)
prnbplaburprot Was urine tested for protein in labour decimal 1 : No
2 : Yes
3 : Not documented
Complete: 10555 (96.49%)
prnbpoedemalab Any oedemas recorded in labour decimal 1 : No
2 : Yes
3 : Not documented
Complete: 10487 (95.87%)
prnbpoedemapreg Any oedemas recorded in pregnancy decimal 1 : No
2 : Yes
3 : Not documented
Complete: 10820 (98.91%)
prnbpoligohydram Oligohydramnios decimal 1 : No
2 : Yes
3 : Not documented
Complete: 10925 (99.87%)
prnbpothmed Other medications taken in last 6 months (y/n) decimal 1 : No
2 : Yes
3 : Not documented
Complete: 10862 (99.30%)
prnbpothmedn Other medications taken in last 6 months (count) decimal mean (sd)
0.46 (0.74)

min < median < max
0.00 < 0.00 < 6.00

Complete: 10651 (97.37%)
prnbppainrellab1 Pain relief in labour (1) text 19 unique values
1755 non-missing values
1 to 19 characters
prnbppainrellab2 Pain relief in labour (2) text 14 unique values
889 non-missing values
1 to 19 characters
prnbppainrellab3 Pain relief in labour (3) text 11 unique values
360 non-missing values
1 to 19 characters
prnbppainrellab4 Pain relief in labour (4) text 7 unique values
144 non-missing values
1 to 18 characters
prnbppainrellab5 Pain relief in labour (5) text 6 unique values
72 non-missing values
1 to 18 characters
prnbppainrellab6 Pain relief in labour (6) text 2 unique values
56 non-missing values
1 to 18 characters
prnbpperinealtr Perineal trauma decimal 1 : None
10 : Not documented
2 : 1st degree
3 : 2nd degree
4 : 3rd degree
5 : 4th degree
6 : Episiotomy
7 : Laceration
8 : Tear
9 : Graze
Complete: 1695 (15.50%)
prnbpplacpraev Placenta praevia decimal 1 : No
2 : Yes
3 : Not documented
Complete: 10928 (99.90%)
prnbppolyhydr Polyhydramnios/hydramnios decimal 1 : No
2 : Yes
3 : Not documented
Complete: 10929 (99.91%)
prnbppostadmany Any hospital admissions postpartum decimal 1 : No
2 : Yes
3 : Not documented
Complete: 10787 (98.61%)
prnbppostadmn Number of hospital admissions post partum decimal mean (sd)
0.01 (0.09)

min < median < max
0.00 < 0.00 < 3.00

Complete: 10716 (97.96%)
prnbppostsutexam Post suturing examination decimal 1 : No
2 : Yes
3 : Not documented
Complete: 791 (7.23%)
prnbppreeclampsia Pre-eclampsia decimal 1 : No
2 : Yes
Complete: 10895 (99.60%)
prnbppregadmany Any hospital admissions in pregnancy decimal 1 : No
2 : Yes
3 : Not documented
Complete: 1803 (16.48%)
prnbppregadmn Number hospital admissions in pregnancy decimal mean (sd)
0.82 (1.32)

min < median < max
0.00 < 0.00 < 15.00

Complete: 1793 (16.39%)
prnbppresutexam Pre suturing examination decimal 1 : No
2 : Yes
3 : Not documented
Complete: 813 (7.43%)
prnbprenalpreg Any renal function recorded in pregnancy decimal 1 : No
2 : Yes
3 : Not documented
Complete: 10889 (99.54%)
prnbprenalpregn Number of renal function observations decimal mean (sd)
1.57 (1.96)

min < median < max
0.00 < 1.00 < 21.00

Complete: 10833 (99.03%)
prnbpsfetgrthret Suspected fetal growth retardation decimal 1 : No
2 : Yes
3 : Not documented
Complete: 10929 (99.91%)
prnbpsyphilis Syphilis decimal 1 : No
2 : Yes
3 : Not documented
Complete: 10928 (99.90%)
prnbpthrpreterm Threatened preterm birth decimal 1 : No
2 : Yes
3 : Not documented
Complete: 10929 (99.91%)
prnbpurtrinf Urinary tract infection decimal 1 : No
2 : Yes
3 : Not documented
Complete: 10928 (99.90%)
prnbpvagbld1st Vaginal bleeding 1st trimester decimal 1 : No
2 : Yes
3 : Not documented
Complete: 10929 (99.91%)
prnbpvagbld2nd Vaginal bleeding 2nd trimester decimal 1 : No
2 : Yes
3 : Not documented
Complete: 10928 (99.90%)
prnbpvagbld3rd Vaginal bleeding 3rd trimester decimal 1 : No
2 : Yes
3 : Not documented
Complete: 10926 (99.88%)
prnpbaddvit Pregnancy vitamins in last 6 months decimal 1 : No
2 : Yes
3 : Not documented
Complete: 10897 (99.62%)
prnpbgestagedpregbk Gestational age in days at BiB pregnancy booking decimal mean (sd)
89.36 (26.37)

min < median < max
0.00 < 84.00 < 271.00

Complete: 10831 (99.01%)
prnpbgestagewpregbk Gestational age in weeks at BiB pregnancy booking decimal mean (sd)
12.77 (3.77)

min < median < max
0.00 < 12.00 < 38.71

Complete: 10831 (99.01%)
prnprexconany Any pre-existing condition decimal 1 : No
2 : Yes
3 : Not documented
Complete: 9673 (88.43%)
prnprexconasthma Pre-existing asthma decimal 1 : No
2 : Yes
3 : Not documented
Complete: 2546 (23.27%)
prnprexconbackprob Pre-existing back problems decimal 1 : No
2 : Yes
3 : Not documented
Complete: 2361 (21.58%)
prnprexcondoth1 Other pre-existing condition 1 text 291 unique values
2545 non-missing values
1 to 42 characters
prnprexcondoth2 Other pre-existing condition 2 text 88 unique values
245 non-missing values
1 to 39 characters
prnprexcondoth3 Other pre-existing condition 3 text 22 unique values
93 non-missing values
1 to 28 characters
prnprexcondoth4 Other pre-existing condition 4 text 5 unique values
89 non-missing values
1 to 18 characters
prnprexconeclampsia Previous eclampsia decimal 1 : No
2 : Yes
3 : Not documented
Complete: 1903 (17.40%)
prnprexconepilepsy Pre-existing epilepsy decimal 1 : No
2 : Yes
3 : Not documented
Complete: 1934 (17.68%)
prnprexconfemcirc Pre-existing female circumcision decimal 1 : No
2 : Yes
3 : Not documented
Complete: 1908 (17.44%)
prnprexconfertprob Pre-existing fertility problems decimal 1 : No
2 : Yes
3 : Not documented
Complete: 2096 (19.16%)
prnprexcongeninf Pre-existing genital infection decimal 1 : No
2 : Yes
3 : Not documented
Complete: 1936 (17.70%)
prnprexcongynprob Pre-existing gynae problems decimal 1 : No
2 : Yes
3 : Not documented
Complete: 2053 (18.77%)
prnprexconheartprob Pre-existing heart problems decimal 1 : No
2 : Yes
3 : Not documented
Complete: 1954 (17.86%)
prnprexconhighbp Pre-existing high blood pressure decimal 1 : No
2 : Yes
3 : Not documented
Complete: 2014 (18.41%)
prnprexconincont Pre-existing incontinence decimal 1 : No
2 : Yes
3 : Not documented
Complete: 1956 (17.88%)
prnprexconkidprob Pre-existing kidney problems decimal 1 : No
2 : Yes
3 : Not documented
Complete: 2001 (18.29%)
prnprexconlivdis Pre-existing liver disease decimal 1 : No
2 : Yes
3 : Not documented
Complete: 1902 (17.39%)
prnprexconmentheal Pre-existing mental illness decimal 1 : No
2 : Yes
3 : Not documented
Complete: 2141 (19.57%)
prnprexconmigraine Pre-existing migraine decimal 1 : No
2 : Yes
3 : Not documented
Complete: 2448 (22.38%)
prnprexconsti Pre-existing constipation decimal 1 : No
2 : Yes
3 : Not documented
Complete: 1940 (17.73%)
prnprexcont1dm Pre-existing type 1 diabetes decimal 1 : No
2 : Yes
3 : Not documented
Complete: 1910 (17.46%)
prnprexcont2dm Pre-existing type 2 diabetes decimal 1 : No
2 : Yes
3 : Not documented
Complete: 1901 (17.38%)
prnprexcontbexp Pre-existing TB exposure decimal 1 : No
2 : Yes
3 : Not documented
Complete: 1935 (17.69%)
prnprexconthromb Pre-existing thrombosis decimal 1 : No
2 : Yes
3 : Not documented
Complete: 1912 (17.48%)
prnprexconthryroid Pre-existing thyroid problems decimal 1 : No
2 : Yes
3 : Not documented
Complete: 2027 (18.53%)
prnprfhistdiab FH of diabetes decimal 1 : No
2 : Yes
3 : Not documented
Complete: 10923 (99.85%)
prnprfhistdiabch FH of diabetes in woman’s child decimal 1 : No
2 : Yes
3 : Not documented
Complete: 10923 (99.85%)
prnprfhistdiabfa FH of diabetes in woman’s father decimal 1 : No
2 : Yes
3 : Not documented
Complete: 10923 (99.85%)
prnprfhistdiabmo FH of diabetes in woman’s mother decimal 1 : No
2 : Yes
3 : Not documented
Complete: 10923 (99.85%)
prnprfhistdiabrelnd FH of diabetes, relationship not documented decimal 1 : No family history
2 : Relatives documented
3 : Relatives not documented
4 : Family history not documented
Complete: 10923 (99.85%)
prnprfhistdiabsb FH of diabetes in woman’s sibling decimal 1 : No
2 : Yes
3 : Not documented
Complete: 10923 (99.85%)
prnprfhistecl FH of eclampsia decimal 1 : No
2 : Yes
3 : Not documented
Complete: 10920 (99.83%)
prnprfhisteclch FH of eclampsia in woman’s child decimal 1 : No
2 : Yes
3 : Not documented
Complete: 10920 (99.83%)
prnprfhisteclfa FH of eclampsia in woman’s father decimal 1 : No
2 : Yes
3 : Not documented
Complete: 10920 (99.83%)
prnprfhisteclmo FH of eclampsia in woman’s mother decimal 1 : No
2 : Yes
3 : Not documented
Complete: 10920 (99.83%)
prnprfhisteclrelnd FH of eclampsia, relationship not documented decimal 1 : No family history
2 : Relatives documented
3 : Relatives not documented
4 : Family history not documented
Complete: 10920 (99.83%)
prnprfhisteclsb FH of eclampsia in woman’s sibling decimal 1 : No
2 : Yes
3 : Not documented
Complete: 10920 (99.83%)
prnprfhisthyp FH of high blood pressure decimal 1 : No
2 : Yes
3 : Not documented
Complete: 10925 (99.87%)
prnprfhisthypch FH of hypertension in woman’s child decimal 1 : No
2 : Yes
3 : Not documented
Complete: 10925 (99.87%)
prnprfhisthypfa FH of hypertension in woman’s father decimal 1 : No
2 : Yes
3 : Not documented
Complete: 10925 (99.87%)
prnprfhisthypmo FH of hypertension in woman’s mother decimal 1 : No
2 : Yes
3 : Not documented
Complete: 10925 (99.87%)
prnprfhisthyprelnd FH of hypertension, relationship not documented decimal 1 : No family history
2 : Relatives documented
3 : Relatives not documented
4 : Family history not documented
Complete: 10925 (99.87%)
prnprfhisthypsb FH of hypertension in woman’s sibling decimal 1 : No
2 : Yes
3 : Not documented
Complete: 10925 (99.87%)
prnprfhistment FH of mental illness decimal 1 : No
2 : Yes
3 : Not documented
Complete: 10926 (99.88%)
prnprfhistmentch FH of mental illness in woman’s child decimal 1 : No
2 : Yes
3 : Not documented
Complete: 10926 (99.88%)
prnprfhistmentfa FH of mental illness in woman’s father decimal 1 : No
2 : Yes
3 : Not documented
Complete: 10926 (99.88%)
prnprfhistmentmo FH of mental illness in woman’s mother decimal 1 : No
2 : Yes
3 : Not documented
Complete: 10926 (99.88%)
prnprfhistmentrelnd FH of mental illness, relationship not documented decimal 1 : No family history
2 : Relatives documented
3 : Relatives not documented
4 : Family history not documented
Complete: 10926 (99.88%)
prnprfhistmentsb FH of mental illness in woman’s sibling decimal 1 : No
2 : Yes
3 : Not documented
Complete: 10926 (99.88%)
prnprfhistthrom FH of thrombosis decimal 1 : No
2 : Yes
3 : Not documented
Complete: 10924 (99.86%)
prnprfhistthromch FH of thrombosis in woman’s child decimal 1 : No
2 : Yes
3 : Not documented
Complete: 10924 (99.86%)
prnprfhistthromfa FH of thrombosis in woman’s father decimal 1 : No
2 : Yes
3 : Not documented
Complete: 10924 (99.86%)
prnprfhistthrommo FH of thrombosis in woman’s mother decimal 1 : No
2 : Yes
3 : Not documented
Complete: 10924 (99.86%)
prnprfhistthromrelnd FH of thrombosis, relationship not documented decimal 1 : No family history
2 : Relatives documented
3 : Relatives not documented
4 : Family history not documented
Complete: 10924 (99.86%)
prnprfhistthromsb FH of thrombosis in woman’s sibling decimal 1 : No
2 : Yes
3 : Not documented
Complete: 10924 (99.86%)