Table 3

Rates of adherence between 2 prenatal multivitamin groups, among subjects with nausea and vomiting of pregnancy (NVP) and study completionβ

Prenatal multivitamin groups, differing in iron content


35 mg iron group (n = 78)
60 mg iron group (n = 62)
p-value (chi-squared test)

No. of subjects with NVP (at time of enrolment)
67 (86%)
56 (90%)
0.59
Proportion who started taking assigned prenatal multivitamin
49/67 (73%)
44/56 (79%)
0.63
Proportion who were ≥ 80% adherent.ψ
17/49 (35%)
18/44 (41%)
0.69

βNo significant difference was detected when partial data from subjects who did not complete the study were included.

ψ Based on at least 80% pill intake

Nguyen et al. BMC Pregnancy and Childbirth 2008 8:17   doi:10.1186/1471-2393-8-17