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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.