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. 2016 Sep 28;145(1):133–140. doi: 10.1017/S0950268816002168

Table 3.

Odds ratios for H7N9 virus according to H9 virus and characteristics of the environment, Zhejiang province, China, March 2013–April 2015

Characteristics H9(−) H9(+)
H7N9(−) H7N9(+) aOR 95% CI P value H7N9(−) H7N9(+) aOR 95% CI P value
Area type
Urban 4871 227 1·00 Ref. 632 102 3·46 2·64–4·53 <0·001
Rural 9167 353 0·94 0·77–1·14 0·529 646 277 4·93 3·90–6·23 <0·001
Premise type
Live poultry  markets 8131 548 12·39 8·57–17·9 <0·001 1017 338 46·80 31·83–68·81 <0·001
Other premises 5907 32 1·00 Ref. 261 41 22·62 13·31–38·44 <0·001
Prefecture
Hangzhou 919 107 1·00 Ref. 78 46 2·94 1·87–4·61 <0·001
Huzhou 1151 166 1·00 0·74–1·35 0·988 83 118 6·86 4·61–10·21 <0·001
Jiaxing 1938 93 0·34 0·25–0·47 <0·001 39 15 2·66 1·3–5·44 0·007
Jinhua 2135 95 0·40 0·3–0·55 <0·001 348 143 2·36 1·72–3·22 <0·001
Lishui, Quzhou,  Taizhou 3385 97 0·17 0·12–0·23 <0·001 515 50 0·35 0·24–0·52 <0·001
Ningbo, Shaoxing,  Wenzhou, Zhoushan 4510 22 0·04 0·02–0·06 <0·001 215 7 0·28 0·12–0·63 0·002
Year
2013 2259 32 1·00 Ref. 199 0 0·00 0·995
2014 7987 292 2·58 1·77–3·76 <0·001 658 99 7·73 5·03–11·87 <0·001
2015 3792 256 5·77 3·93–8·48 <0·001 421 280 40·67 27·11–61·02 <0·001
Sample type
Poultry faeces 6168 187 1·00 Ref. 390 130 6·51 4·92–8·63 <0·001
Poultry cage swab 2927 142 1·80 1·41–2·3 <0·001 225 64 5·58 3·89–7·99 <0·001
Drinking water for  poultry 1418 38 2·00 1·37–2·91 <0·001 158 32 6·00 3·8–9·47 <0·001
Sewage from cleaning  poultry 1080 63 2·52 1·83–3·46 <0·001 160 51 9·63 6·49–14·28 <0·001
Swabs of tables for  slaughtering or  holding poultry 1499 105 2·00 1·54–2·62 <0·001 276 81 7·58 5·42–10·59 <0·001
Others 946 45 2·58 1·79–3·72 <0·001 69 21 26·15 13·6–50·26 <0·001

aOR, Adjusted odds ratio; CI, confidence interval.