How to identify multiple births in the LS


LS members who are part of multiple births can be identified in three main ways:

  1. At birth. Variable MLCSANB (in table NBIR) shows the number of births from this pregnancy, and whether each was a live- or stillbirth. LS members will only have a record in NBIR if they were born in England or Wales after the 1971 Census.

    Babies born alive on the same day as the LS member will of course also be LS members; their records can be paired together using the variable CORENO (in table CORE1) as members of multiple births will have consecutive identification numbers.


  2. In the 1971 Census, if the LS member is in the same household as his/her mother, and the mother is ever-married and aged 16-59 years. The mother's fertility history can be used to establish whether the LS member was a single or multiple birth (by comparing the dates of birth of her children). This will only be possible if the LS member was born in marriage and if s/he was child number one to six or the latest child of the mother - otherwise s/he will be missing from the mother's fertility history.

    Babies born alive on the same day as the LS member will of course also be LS members; as long as they are both enumerated at the 1971 Census, their records can be paired together by using the variable CORENO (in table CORE1) as members of multiple births will have consecutive identification numbers. This will work even if they are not in the same household at any subsequent census.


  3. Where the twins (or triplets etc.) are found in the same household at any census (including 1971). LS members who are part of multiple births can be identified by having a sibling with the same age and year of birth (of course this requires that both siblings are still alive). This is a less satisfactory method of identifying multiple births because some pairs of twins (or triplets etc.) will be in different households, especially if they are adults.

Multiple births to LS mothers can be identified in the same ways:

  1. At birth, using variable MLCSANB in tables LBSM (for live births) and SBSM (for stillbirths).
  2. Each infant of the pregnancy, whether live- or stillborn, will have a separate record in one of these two tables.
  3. At the 1971 Census. If the LS mother is ever-married and aged 16-59, she will be asked to list the dates of birth of all her children born alive in marriage. The LS includes month (C1BMT7-C6BMT7) and year (C1BYR7-C6BYR7) of birth of the first six children and the latest child (C7BMT7 and C7BYR7), plus the total number of children listed (variable NUMCH7).

  4. At another census, where the LS mother and all the live-born members of the multiple birth are living in the same household.

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Last modified 8 August 2011