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Bearing in mind t he fact t ha t this was a prospective study and
therefore some 20% or even more sUbjects could be lost du r I nq
follow-up, the mi n imum number of study SUbjects was e l evat cd
to 450.
SUb j e c t Rec rui tmen t and Elig i b i lity: Because ab out 25 pc e t e ne s
deliver each day at t he study center, a three week period was
c h o s e n f o r SUbject recruitment. During t his pe riod, a ll
consecutive s ubjects reporting f rom home t o the labour wa rd
for delivery, were co nsidered as the i ntended sample . Of
t hese , t hose who del ivered vaginally a nd gave i nformed c onsent
were eligible and we r e recruited into the study for f ollow- up .
Excluded from t he sample wer-e the following subjects :
ea
SUbjects not from home eg o r eferred or admitted for more
t han 48 hou r s ,
False labours,
Those who had operative abdominal delivery, and
Subjec t s who did not g ive consent.
SUbj ects we r e e nrol led by a t r a in ed research assistant Who was
a l s o a qu>t.li f ied nu rse-midwife. Pati ents were co ntacted after
t hey had su ccessf.ully de l i vere d t heir ba b i e s . were transferred
t o lyi ng-i n wards, and were r e ady fo r discharge . The r ec r uited
SUbjects were p r ov i d ed with a special i d e nt ity card (APPENDIX
B) f or use in attending t he follow-up clinic and a lso for
other clinics if t hey requir e d prio r med i c al attention .