Data is from two sources; BIS1 form (antenatal recruitment ) and BIS2 form (mother withdrawal)
Unique identifier studyno
bis_mother links to the other MEIRU database table(s) using keys as indicated below in the form tablename key
bis_baby (BIS3 and BIS5) ident
ser_specimen spectype+labno
gen_identity ident
| Cases: | 312 |
| Variables: | 144 |