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Table 1 Characteristics of H7N9 human infections by wave of infection— Zhejiang Province, China, March 2013-February 2015

From: Human infection and environmental contamination with Avian Influenza A (H7N9) Virus in Zhejiang Province, China: risk trend across the three waves of infection

Characteristics Total (n = 170) Wave
First (n = 45) Second (n = 94) Third (n = 31) Statistic P value
Rural, n (%) 88(51.8) 19(42.2) 48(51.1) 21(67.7) 4.549 0.038
Onset after closure of live poultry markets, n (%) 32(18.8) 5(11.1) 17(18.1) 10(32.3) 5.067 0.027
Deaths, n (%) 56(32.9) 10(22.2) 39(41.5) 13(41.9) 3.767 0.052
Age (years) 56.5 ± 16.1 59.7 ± 14.4 55.3 ± 17.5 55.7 ± 13.6 1.170 0.313
Male, n (%) 114(67.1) 28(62.2) 64(68.1) 22(71.0) 0.736 0.699
Occupation, n (%)      16.001 0.068
Farmer 81(47.6) 17(37.8) 44(46.8) 20(64.5)   
Homemaker 11(6.5) 4(8.9) 3(3.2) 4(12.9)   
Retiree 37(21.8) 14(31.1) 18(19.1) 5(16.1)   
Self-employed 22(12.9) 6(13.3) 14(14.9) 2(6.5)   
Worker 16(9.4) 4(8.9) 12(12.8) 0(0.0)   
Child 3(1.8) 0(0.0) 3(3.2) 0(0.0)