almost significantP = 0.05
In univariate regression analysis (no adjustment), serum VitB12 level exhibited an almost significant association with insomnia (OR: 1.50, 95% CI: 1.00–2.14; P = 0.05) but no association with poor sleep quality (global PSQI score>5) (OR: 1.28, 95% CI: 0.92–1.79; P = 0.14).