Table 4.

Risk ratio for nephrotic syndrome relapse in 306 children who received and did not receive flu vaccination (multivariate analysis).

Variable	Risk ratio	95% Confidence interval	P value
For NS relapse
Received flu vaccines (reference: no vaccines)	0.22	0.14–0.35	< 0.0001
Female (reference: male)	1.08	0.80–1.47	0.61
Age at onset of NS	0.99	0.95–1.02	0.41
Past history of FRNS or SDNS or SRNS (reference: no history of FRNS or SDNS or SRNS)	2.80	1.90–4.11	< 0.0001

NS; nephrotic syndrome, Flu; influenza virus, FRNS; frequently relapsing NS, SDNS; steroid-dependent NS, SRNS; steroid-resistant NS.