Fig. 1

Threshold effect analysis takes the break point (k) as 6. When k < 6 the OR = 0.97 (0.91, 1.03) and p = 0.3164; when k > 6, the OR = 1.04 (1.00, 1.07) and p = 0.0323
Threshold effect analysis takes the break point (k) as 6. When k < 6 the OR = 0.97 (0.91, 1.03) and p = 0.3164; when k > 6, the OR = 1.04 (1.00, 1.07) and p = 0.0323