Table 2

Comparison of cases (hospitalized patients) and controls (outpatients) with confirmed pandemic influenza A (H1N1) 2009
Independent variables Cases(N = 699) Controls (N = 699) Crude OR (95%) Adjusted OR (95%)
Sex Male 342 301 1 1
Female 356 397 0.79 (0.61 – 1.01) 0.72 (0.51 – 1.01)
Ethnicity White 588 634 1 1
Other 88 42 2.39** (1.45 – 3.98) 2.18** (1.17 – 4.08)
Educational level No/primary education 263 152 1 1
Secondary or higher 387 498 0.38** (0.27 – 0.53) 0.56** (0.36 – 0.87)
Overcrowding > = 29 m2 234 252 1 1
28 – 15 m2 237 240 1.07 (0.78 – 1.49) 1.09 (0.76 – 1.57)
<= 14 m2 41 20 3* (1.04 – 10.55) 2.84* (1.20 – 6.72)
Unfavourable medical factors 0 242 382 1 1
1 230 238 1.78** (1.25 – 2.53) 1.60* (1.07 – 2.40)
2 122 58 3.99** (1.99 – 8.03) 2.94** (1.61 – 5.36)
>2 105 21 38** (6.42 – 153.99) 18.51** (6.08 – 56.41)
Previous preventive information Yes 577 639 1 1
No 122 60 2.38** (1.56 – 3.66) 2.69** (1.50 – 4.83)
Prior pandemic vaccination No 691 697 1 1
Yes 7 1
Previous outpatient care No 357 557 1 1
Yes 342 142 4.57** (3.23 – 6.51) 3.46** (2.22 – 5.39)
Previous emergency care No 488 603 1 1
Yes 211 96 3.02** (2.10 – 4.35) 2.68** (1.66 – 4.32)

Results of the bivariate analysis (crude OR) and conditional logistic regression (adjusted OR).

(*)P <0.05, (**) p <0.01.

Mayoral et al.

Mayoral et al. BMC Public Health 2013 13:118   doi:10.1186/1471-2458-13-118

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