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Table 3 Relative risks a for the occurrence of menarche according to total soy and soy foods consumption at the continuous and categorical levels

From: Is soy intake related to age at onset of menarche? A cross-sectional study among adolescents with a wide range of soy food consumption

  Continuous level (1/day) p-value Level of soy consumptionb
    Quartile 1 Quartile 2 Quartile 3 Quartile 4
Total soy       
  Median intake, svg/wk    0.0 4.5 13.5 24.2
  Median AOM, yrc    12.6 12.4 12.5 12.6
  Relative risk 0.99 (0.91, 1.07) 0.770 1.00 Ref 0.96 (0.66, 1.40) 0.95 (0.64, 1.41) 1.19 (0.79, 1.80)
Meat alternatives       
  Median intake, svg/wk    0.0 2.5 8.0 14.5
  Median AOM, yrc    12.5 12.5 (12.5) 12.8 (12.7) 12.5
  Relative risk 1.01 (0.90, 1.13) 0.838 1.00 Ref 0.92 (0.62, 1.36) 1.02 (0.70, 1.48) 1.07 (0.70, 1.65)
    Non-consumers Low-moderate High
Tofu/Traditional soy      
  Median intake, svg/wk    0.0 1.0 4.8
  Median AOM, yrc    12.5 12.6 12.4
  Relative Risk 0.90 (0.70, 1.16) 0.401 1.00 Ref 0.93 (0.68, 1.26) 1.00 (0.72, 1.40)
Soy beverages      
  Median intake, svg/wk    0.0 1.5 8.5
  Median AOM, yrc    12.6 12.4 12.6
  Relative Risk 0.98 (0.84, 1.14) 0.759 1.00 Ref 1.07 (0.79, 1.46) 1.12 (0.82, 1.54)
  1. aCox proportional hazards regression model adjusted for total food intake, age, site, type of school, mother’s and father’s education, mother’s and father’s ethnicity, meat intake, and BMI z-scores.
  2. bLevels of consumption for total soy and meat alternatives are in quartiles while that for tofu/traditional soy and soy beverages are categorized as non-consumers (“0” soy consumption), low-to-moderate consumers (≤75th percentile excluding non-consumers) and high consumers (>75th percentile) due to more skewed distributions.
  3. cAOM = age at onset of menarche, excludes those who have not reached menarche.
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