LS variable metadata
Variable: DOCONBM
Table: LBSM
Short description: Date of conception for this birth.
Full description: Derived using date of birth minus gestation period.
Coding notes: Format: YYYYMMDD If a gestation period is known, a further gestation period will be calculated by deducting 14 days. If the result is less than zero, the gestation period will be zero. If no gestation period is known, then a period of 231 days is used. In practice, all valid values are exactly 33 weeks (231 days) before the actual birth date.
Notes:  
Units of measurement:  
Source:  
Former name of variable:  
Derived: Y
Derivation: Not available
Subject:  
Date range: From: 19970101  
Keyword: Fertility
Classification:  
Comparable variables for other individuals:  
Comparable variables for other times:  
Restricted: N
Data type: Text
Length of field: 8