Table 2.

Distribution of refractive error in relation different socio-demographic variables (N=2002)

Variables	Refractive errors: No. (%)		Odds ratio (95% C.I) and P value
	Present (N=274)	Absent (N=1728)
Gender:
Male	113 (11.7)	853(89.1)	Reference
Female	161(15.5)	875(88.5)	1.39(1.06-1.81)*
Residence:
Rural	123(21.9)	438(78.1)	2.40(1.83-3.14)**
Urban	151(10.5)	1290(89.5)	Reference
Age Groups:
6-<9 years	85(9.8)	785(90.2)	Reference
9-<12 years	77(8.6)	820(91.8)	0.43(0.32-.058)**
12-14 years	112(47.5)	123(52.3)	9.02(6.59-12.35)**
School grade:
1	23(8.3)	254(91.7)	1.00†
2	37(10.3)	322(89.7)	1.27
3	33(8.3)	366(91.7)	1.00
4	31(8.8)	322(91.2)	1.06
5	79(21.9)	281(78.1)	3.10
6	71(28.0)	183(72.0)	4.28l**

C.I= Confidence intervals,

^*P value <0.05,

^**P value<0.001,

^†Chi-square for trend.