TABLE 3.

Multiple Logistic Regression Odds of Vision Impairment and Blindness in the 2014 Study Sites by Sex, Age, and Education Level

	Presenting Visual Acuity			Best-Corrected Visual Acuitya
Degree of Impairment, by Site	Female Sex	Age (y)	Education Level	Female Sex	Age (y)	Education Level
Beijing
<20/63 to 20/400	1.43 (1.12–1.83)**	1.10 (1.08–1.13)**	0.92 (0.72–1.18)	1.58 (0.98–2.56)	1.14 (1.12–1.17)**	1.01 (0.78–1.32)
<20/400	0.72 (0.33–1.57)	1.08 (1.02–1.15)*	0.66 (0.37–1.17)	0.43 (0.18–1.02)	1.07 (1.00–1.14)*	0.68 (0.40–1.16)
Jiangsu
<20/63 to 20/400	1.26 (1.09–1.47)**	1.10 (1.09–1.12)**	0.85 (0.76–0.95)**	1.05 (0.79–1.40)	1.12 (1.09–1.14)**	0.77 0.66–0.90)**
<20/400	0.72 (0.40–1.29)	1.13 (1.07–1.18)**	0.87 (0.65–1.16)	0.70 (0.35–1.38)	1.14 (1.08–1.21)**	0.90 (0.62–1.32)
Guangdong
<20/63 to 20/400	1.32 (1.10–1.60)**	1.11 (1.10–1.12)**	0.85 (0.77–0.93)**	2.09 (1.65–2.66)**	1.13 (1.11–1.14)**	1.02 (0.85–1.22)
<20/400	2.07 (1.46–2.93)**	1.09 (1.06–1.11)**	0.88 (0.64–1.20)	1.80 (1.23–2.63)**	1.10 (1.07–1.13)**	0.86 (0.65–1.14)
Heilongjiang
<20/63 to 20/400	1.70 (1.34–2.15)**	1.10 (1.08–1.11)**	0.90 (0.80–1.02)	1.43 (1.05–1.94)*	1.12 (1.10–1.14)**	0.80 (0.69–0.92)**
<20/400	1.58 (1.02–2.43)*	1.09 (1.05–1.12)**	0.74 (0.56–0.97)*	1.65 (1.02–2.66)*	1.10 (1.06–1.14)**	0.79 (0.61–1.02)
Jiangxi
<20/63 to 20/400	1.53 (1.20–1.94)**	1.13 (1.12–1.15)**	0.83 (0.73–0.94)**	1.75 (1.07–2.86)*	1.12 (1.10–1.15)**	0.88 (0.74–1.06)
<20/400	1.61 (0.99–2.60)	1.10 (1.06–1.14)**	0.97 (0.75–1.25)	1.45 (0.86–2.47)	1.11 (1.07–1.15)**	0.96 (0.73–1.25)
Hebei
<20/63 to 20/400	1.46 (1.12–1.92)**	1.14 (1.12–1.15)**	0.91 (0.81–1.03)	1.96 (1.38–2.78)**	1.16 (1.14–1.18)**	0.93 (0.78–1.11)
<20/400	1.19 (0.58–2.46)	1.10 (1.07–1.14)**	0.89 (0.62–1.27)	0.99 (0.41–2.39)	1.11 (1.07–1.16)**	0.83 (0.53–1.30)
Ningxia
<20/63 to 20/400	1.17 (0.93–1.48)	1.06 (1.05–1.07)**	0.87 (0.78–0.96)*	1.11 (0.94–2.22)	1.08 (1.05–1.10)**	0.88 (0.70–1.11)
<20/400	2.22 (1.18–4.17)*	1.09 (1.04–1.13)**	0.73 (0.50–1.07)	1.88 (0.79–4.47)	1.12 (1.06–1.17)**	0.81 (0.50–1.31)
Chongqing
<20/63 to 20/400	1.38 (1.11–1.71)**	1.09 (1.08–1.10)**	0.70 (0.60–0.81)**	1.43 (1.05–1.95)*	1.10 (1.09–1.11)**	0.75 (0.61–0.92)**
<20/400	1.65 (1.07–2.53)*	1.09 (1.07–1.12)**	0.63 (0.48–0.82)**	1.30 (0.83–2.04)	1.11 (1.08–1.15)**	0.54 (0.36–0.81)**
Yunnan
<20/63 to 20/400	1.03 (0.87–1.21)	1.09 (1.07–1.10)**	1.15 (1.00–1.32)*	1.09 (0.86–1.40)	1.11 (1.09–1.12)**	1.14 (0.87–1.51)
<20/400	1.08 (0.84–1.39)	1.14 (1.12–1.17)**	1.49 (0.92–2.40)	1.13 (0.84–1.51)	1.14 (1.12–1.17)**	1.43 (0.95–2.18)
All study sites
<20/63 to 20/400	1.29 (1.20–1.38)**	1.10 (1.09–1.10)**	0.80 (0.77–0.84)**	1.41 (1.26–1.57)**	1.11 (1.10–1.12)**	0.82 (0.77–0.87)**
<20/400	1.21 (1.05–1.40)**	1.10 (1.09–1.11)**	0.70 (0.64–0.76)**	1.12 (0.95–1.32)	1.11 (1.10–1.13)**	0.70 (0.63–0.76)**

Data are given as odds ratios (95% confidence intervals) with age and education level as continuous variables in modeling vision impairment (<20/63–20/400) and blindness (<20/400). Statistical significance at the P ≤ .05 level is indicated by 1 asterisk (*) and significance at the P ≤ .01 level by 2 asterisks (**).

^aBest-corrected visual acuity was not available in either eye for 71 of the 16 624 persons with presenting vision impairment: 2 in Jiangsu, 32 in Guangdong, 24 in Heilongjiang, 4 in Jiangxi, 4 in Hebei, 2 in Ningxia, and 3 in Chongqing.