Table 2

Differences in mean ± SD GI and numbers of women within each quartile of GI between the intervention and control group from trimester 1 to trimester 3
Trimester 1 Trimester 2 Trimester 3 P2
I C I C I C
GI 57.3 ± 4 57.7 ± 4 56.1 ± 4 57.8 ± 4 56 ± 3.7 57.7 ± 3.9 <0.001
P 0.251 P <0.0011 P <0.0011
N (%) N (%) N (%)
Quartile GI
1* 37.4 32.2 50.2 30.5 51.5 31.2
2 16.2 20.0 13.6 19.3 16.2 19.3
3 23.4 19.3 18.3 22.1 17.9 23.9
4 23.0 28.4 17.9 28.1 14.5 25.6
P 0.213 P <0.0013 P <0.0013

C, control group (n = 285); I, intervention group (n = 235).

*Quartile 1 (GI values 49.7 - 55.9); quartile 2 (GI values 56.0 -57.6); quartile 3 (GI values 57.7 – 59.9); quartile 4 (GI values 60.0 – 69.7).

1Differences in mean GI between groups across trimesters were compared using independent samples t-test.

2Differences in mean GI between trimester 1 and 2 and trimesters 1 and 3 within the intervention group assessed by ANOVA.

3Differences in numbers of women within each quartile of GI between groups were compared using the χ2 test.

McGowan et al.

McGowan et al. Nutrition Journal 2013 12:140   doi:10.1186/1475-2891-12-140

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