Table 2 The association of WWI and BMI (kg/m²) with serum ferritin (ng/ml)

WWI

6.67 (2.30, 11.04)

10.34 (5.56, 15.13)

8.62 (3.53, 13.72)

Quartiles of WWI

 Q1 (8.44–10.55)

Reference

Reference

Reference

 Q2 (10.56–11.13)

23.94 (14.13, 33.75)

15.09 (5.71, 24.47)

6.55 (− 2.82, 15.93)

 Q3 (11.14–11.70)

19.99 (9.73, 30.24)

12.11 (1.91, 22.30)

7.01 (− 3.42, 17.45)

 Q4 (11.71–14.14)

13.91 (3.50, 24.32)

19.89 (8.85, 30.92)

18.15 (6.58, 29.73)

P for trend

 < 0.01

 < 0.01

 < 0.01

BMI (kg/m²)

0.67 (0.16, 1.18)

0.82 (0.35, 1.30)

0.68 (0.17, 1.19)

Quartiles of BMI (kg/m²)

 Q1 (14.20–24.80)

Reference

Reference

Reference

 Q2 (24.81–18.70)

27.45 (17.22, 37.68)

7.28 (− 2.35, 16.90)

− 0.81 (− 10.40, 8.77)

 Q3 (28.71–33.60)

39.90 (29.60, 50.20)

17.89 (8.18, 27.60) 0.0003

9.10 (− 0.89, 19.10)

 Q4 (33.61–82.0)

24.21 (13.90, 34.52)

18.99 (9.36, 28.63) 0.0001

13.72 (3.23, 24.20)

P for trend

 < 0.01

 < 0.01

 < 0.01