Table 1

Baseline characteristics by category of egg consumption among 461 213 participants

CharacteristicsEgg consumptionOverall
(n=461 213)
Never/rarely
(n=42 046)
1–3 days/month
(n=92 568)
1–3 days/week
(n=2 16 990)
4–6 days/week
(n=49 182)
7 days/week
(n=60 427)
Usual amount (egg/day)0.290.360.460.560.760.47
Age (years)52.3 (10.8)51.2 (10.6)50.2 (10.3)49.7 (10.3)51.6 (10.9)50.7 (10.5)
Men (%)33.938.642.242.344.241.0
Urban residence (%)29.832.346.533.957.842.3
 Highest education (%)
 Middle or high school39.841.544.345.348.443.7
  College and above3.13.65.57.38.35.7
Household income (yuan/year, %)
 10 000–19 99930.429.529.628.727.228.8
 ≥20 00034.837.642.249.149.542.6
Married (%)89.090.091.292.492.891.1
Current drinking (%)19.317.918.618.521.015.2
Current smoking (%)34.132.632.131.532.729.5
Physical activity (MET-hour/day)21.5 (13.5)22.1 (14.4)21.9 (14.1)21.9 (13.2)21.7 (13.1)21.9 (13.9)
Dietary pattern (%)
 New affluence10.310.219.035.655.654.0
 Traditional southern64.664.156.641.023.723.5
Multivitamin supplementation (%)2.72.63.44.46.53.7
BMI (kg/m2)23.7 (3.5)23.5 (3.3)23.5 (3.3)23.5 (3.3)23.4 (3.4)23.5 (3.3)
Hypertension (%)36.934.132.230.529.032.4
Family history of CVD (%)20.219.319.620.321.019.9
  • Values (except for the usual amount) according to the frequency of egg consumption were either proportion or mean (SD) with adjustment for age at recruitment, sex and survey site where appropriate, using logistic regression (for categorical variables) or multiple linear regression (for continuous variables). These variables were categorised into three levels: highest education level (primary school and below, middle or high school, or college and above), household income (<10 000, 10 000–19 999, or ≥20 000) and dietary pattern (new affluence, traditional southern or traditional northern).

  • BMI, body mass index; CVD, cardiovascular disease; MET, metabolic equivalent task.