Table 4.

Cox regression model of factors associated with frequently relapsing nephrotic syndrome at 2 years after initial therapy (n=138)

Factor	Unadjusted			Adjusted
	HR	95% CI	P	HR	95% CI	P
Male (versus female)	1.32	0.63–3.02	0.47	1.41	0.64–3.34	0.40
Onset age (<5 to ≥5 yr)	2.69	1.31–5.94	0.007	1.50	0.71–3.39	0.29
Serum sodium (<135 to ≥135 mEq/L)	2.54	1.15–5.22	0.02	1.34	0.59–2.83	0.47
Time from start of initial treatment to disappearance of proteinuria (≥9 to <9 d)	6.65	3.17–15.19	<0.001	3.09	1.42–7.27	0.004
Time from start of initial treatment to first relapse (<6 to ≥6 mo)	8.66×106	29.46–N/A	<0.001	5.09×106	16.56–2.06×10184	<0.001

HR, hazard ratio; CI, confidence interval; N/A, not available.