Prenatal Record - National Archives and Records Administration

OB-3
History Since Last Menstrual Period
Form OB-3 was used to provide details about early pregnancy. Data were
obtained through interviews with the gravida. First implemented in January
1959, the form was revised once in November of that year. The order of item
numbers was changed and some of the wording was altered during revision. Only
one card (number 0303) was used to record the 56,771 records obtained during
the study (Table OB-3.1}. Titles and items on the card refer to the last
revision. For cards coded from the form dated January 1959, item numbers may
differ slightly.
TABLE OB-3.1
Cards and Data Records by Revision for Form OB-3
CARD REV. NUMBER
CARD NAME NUMBER NO. RECORDS
OB-3: History Since Last Menstrual
Period
0303
0 8,851
1 47,920
56,771
total for form 56,771
Reproduced at the National Archives
II.A.37
OB-3