Centre for Longitudinal Studies

07339085 C Twins, plus two other babies, out of chronol. order.

07342034 C Twins placed in slots 26, 27 when 11,16,21 vacant. Move to slots 11-12.

08039031 C Abortion, then twins 5 months later (each 5lbs 7 oz) 5 months later. Switch to same preg.

08129032 Live birth, then double abortion 3 months later, diff.preg. Assume OK.

08995083 C Two other babies from years earlier bunched in same pregnancy as twins.

10822000 C Two babies with same d.o.b. in slots 1,11. Move to slots 1,2.

11155092 C Twins in slots 1,2, then twins in slots 6 & 7 with same birth dates. DELETE 2^nd pair*.

12150094 C Twins, plus three other babies, out of chronol. order.

12693010 C Two miscarriages in same month, in slots 11 and 16. Assume double miscarriage.

12958013 C Twins, plus two other babies, out of chronol. order and all bunched in same pregnancy.

14046048 C Two abortions, both June 1988, in slots 11 and 26. Assume 26 is coding error, and DELETE.

14989074 C 2 live births, same date, in slots 1, 11. Both 9 lb 2 oz!! Assume 11 is coding error -DELETE.

15372086 C Twins, plus one other baby, out of chronol.order.

16102076 C Twins, plus two other babies, out of chronol. order and all bunched in same pregnancy.

* The birth weights of the first two were 4lb 9 oz and 5lb 2oz. The second pair were 4 lb 9oz and
unspecified. It seems very unlikely indeed that quads could have such high birthweights. We
therefore assumed this was a data entry duplication (the fact that two birth weights are exactly the same
also supports this hypothesis).

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