Table 3. Association between demographic, lifestyle, and unstable tear group.

Variables	Prevalence, n (%)	Crude OR (95%CI)	P	Multi-adjusted OR (95%CI)	P
Sex
M	537/655 (82.0)	1.00		1.00
F	143/203 (70.4)	0.52 (0.36-0.75)	<0.001	0.74 (0.50-1.09)	0.122
Age (y)
20-39	178/254 (70.1)	1.00		1.00
≥40	502/604 (83.1)	2.10 (1.49-2.96)	<0.001	1.53 (1.06-2.20)	0.023
Current smoker
No	562/712 (78.9)	1.00
Yes	118/146 (80.8)	1.12 (0.72-1.76)	0.608
VDT (h)
<8	313/377 (83.0)	1.00		1.00
≥8	367/481 (76.3)	0.66 (0.47-0.93)	0.016	0.78 (0.55-1.12)	0.180
CL use
No	537/632 (85.0)	1		1.00
Yes	143/226 (63.3)	0.30 (0.22-0.43)	<0.001	0.37 (0.26-0.53)	<0.001
Stress
No	263/327 (80.4)	1.00
Yes	417/531 (78.5)	0.89 (0.63-1.25)	0.506

VDT: Visual display terminal; CL: Contact lens. Adjusted for age and all of the associated factors identified in the univariate analyses (P<0.2).