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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

From: The influence of a low glycemic index dietary intervention on maternal dietary intake, glycemic index and gestational weight gain during pregnancy: a randomized controlled trial

  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  
  1. C, control group (n = 285); I, intervention group (n = 235).
  2. *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).
  3. 1Differences in mean GI between groups across trimesters were compared using independent samples t-test.
  4. 2Differences in mean GI between trimester 1 and 2 and trimesters 1 and 3 within the intervention group assessed by ANOVA.
  5. 3Differences in numbers of women within each quartile of GI between groups were compared using the χ 2 test.