a trend toward significanceP = 0.062
SUI was statistically significantly associated with obesity (χ 2 = 4.24; df = 1; P = 0.039), limited exposure to sunlight (less than 1 hour per day) (χ 2 = 4.20; df = 1; P = 0.040) with a trend toward significance in women with serum vitamin D levels below 20.0 ng/ml (χ 2 = 3.47; df = 1; P = 0.062).