TABLE 4.

UNADJUSTED EFFECT OF RISK FACTORS FOR FELLOW EYE INVOLVEMENT FROM UNIVARIATE COX PROPORTIONAL HAZARDS REGRESION MODELS STRATIFIED BY AGE BETWEEN PATIENTS WITH NONARTERITIC ANTERIOR ISCHEMIC OPTIC NEUROPATHY UNDER AGE 50 (NAIONY) AND AGED 50 AND OVER (NAIONO)

RISK FACTOR	NAIONy N=108	NAIONo N=108
Male gender	HR=0.58	HR=0.67
	95% CI=0.31 – 1.07	95% CI=0.31 – 1.42
	P=.080	P=.29
Hypertension	HR=0.66	HR=1.25
	95% CI=0.35 – 1.23	95% CI=0.61 – 2.55
	P=.19	P=.54
Diabetes	HR=3.10	HR=1.03
	95% CI=1.49 – 6.46	95% CI=0.42 – 2.53
	P=.003	P=.95
	n=107	n=106
Chronic renal failure	HR=2.34	HR=5.50
	95% CI=0.98 – 5.60	95% CI=0.71 – 42.71
	P=.057	P=.10
Crowded disc	HR=1.26	HR=2.65
	95% CI=0.45 – 3.55	95% CI=0.92 – 7.68
	P=.66	P=.072
		n=107
Anemia	HR=1.64	HR=1.50
	95% CI=0.57 – 4.72	95% CI=0.19 – 11.63
	P=.36	P=.70
	n=86	n=54
Migraine	HR=1.75	HR=1.03
	95% CI=0.88 – 3.46	95% CI=0.31 – 3.45
	P=.11	P=.96
	n=98	n=102
Hyperlipidemia	HR=1.03	HR=1.88
	95% CI=0.48 – 2.22	95% CI=0.58 – 6.08
	P=.94	P=.29
	n=73	n=57
Smoking	HR=0.49	HR=1.82
	95% CI=0.23 – 1.02	95% CI=0.75–4.44
	P=.058	P=.19
	n=100	n=90

CI, confidence interval; HR, hazard ratio.