Prevalence and associated factors for pterygium in Han and Mongolian adults: a cross-sectional study in inner Mongolian, China

Table 9 Multivariate logistic regression analysis for factors associated with pterygium

	OR(95% CI)	P Value
Age, y
30–39	1
40–49	1.22(0.66–2.25)	0.518
50–59	2.86(1.59–5.16)	< 0.001	***
≥ 60	2.79(1.48–5.26)	0.001	**
P for trend		< 0.001
Sex
Male	1
Female	0.62(0.28–1.38)	0.240
Race
Han	1
Mongolian	0.92(0.63–1.35)	0.674
Survey sites
Wuyuan	1
Hohhot	0.44(0.26–0.76)	0.003	**
Tsining District	0.30(0.17–0.52)	< 0.001	***
Xilingol League	1.02(0.67–1.55)	0.941
P for trend		< 0.001
Time in rural
≤ 1 year	1
1–10 years	1.47(0.59–3.62)	0.405
11–20 years	1.48(0.89–2.47)	0.135
21–30 years	0.95(0.56–1.60)	0.833
> 30 years	1.98(1.29–3.03)	0.002	**
P for trend		0.015
BMI level
<24	1
24–27.9	0.88(0.52–1.46)	0.611
≥ 28	0.45(0.19–1.03)	0.058
P for trend		0.060
Body fat percentage, n%	1.04(0.99–1.10)	0.132
Low-density lipoprotein cholesterol (LDLC), mmol/L
< 4.14	1
≥ 4.14	1.51(0.90–2.54)	0.123
Education level
Elementary or lower	1
Middle school or higher	0.70(0.45–1.09)	0.114
Occupation
Indoor	1
Outdoor	1.78(1.09–2.90)	0.020	*
Smoking status
Never	1
Ever	1.09(0.69–1.72)	0.719

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