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Table 1 Descriptive statistics of validation cohort and microbiota subset

From: Use of dietary indices to control for diet in human gut microbiota studies

Characteristic (measure)

Validation cohort

Microbiota subset

n

5047

2070

Sex (%female)

91.2

90

Zygosity (% MZ)

56.8

55.9

Ethnicity (% white)*

98.2

98.6

Age (at FFQ) (μ,σ2)

58.4 (13.2)

60.5 (11.5)

BMI (μ,σ2)*

26.2 (5)

25.9 (4.7)

FI (μ,σ2)*

0.2 (0.1)

0.19 (0.1)

HEI (μ,σ2)

60 (10.3)

60.4 (10.2)

MDS (μ,σ2)

4.6 (1.8)

4.5 (1.8)

HFD-index (μ,σ2)

0.2 (0.1)

0.2 (0.1)

  1. Descriptive statistics of cohorts used to validate (validation cohort) three dietary indices and assess association with the microbiota (microbiota subset). Presented also are the means (μ) and standard deviation (σ2) of the three indices: the Healthy Eating Index (HEI), the Mediterranean Diet Score (MDS) and Healthy Food Diversity index (HFD-index). Zygosity is presented as % mono-zygotic twins (MZ), age as the date at which the Food Frequency Questionnaire (FFQ) was administered, body mass index by BMI (kg/m2), and frailty index (proportion of age-related health-deficits) as FI. *Data available on 88–90% subjects for these variables