Table 1

Characteristics of matched cases (hospitalized inpatients) and controls (outpatients) with confirmed pandemic influenza A (H1N1) 2009
Characteristic Cases Controls
N (699) N (699)
Mean age (*) 37.82 33.69
Sex Male (*) 342 (49.1) 301 (43.1)
Female (*) 356 (50.9) 397 (56.9)
Ethnicity White (**) 588 (87.1) 634 (94.1)
Roma (**) 15 (2.2) 2 (0.3)
Amerindian (**) 46 (6.8) 16 (2.4)
Arab or North African (*) 17 (2.5) 6 (0.9)
Other 10 (1.5) 18 (2.7)
Educational level No formal education (**) 50 (7.7) 24 (3.7)
Primary (**) 213 (32.8) 128 (19.7)
Secondary 295 (45.4) 311 (47.8)
Higher (**) 92 (14.2) 187 (28.8)
Overcrowding > = 29 m2/p 234 (45.7) 252 (49.2)
28 - 15 m2/p 237 (46.3) 240 (47.1)
<= 14 m2/p (**) 41 (8) 20 (3.7)
Unfavourable medical factors 0 (**) 242 (34.6) 382 (54.6)
1 230 (32.9) 238 (34)
2 (**) 122 (17.5) 58 (8.3)
>2 (**) 105 (15) 21 (3)
Prior preventive information Yes (**) 577 (82.5) 639 (91.4)
No (**) 122 (17.5) 60 (8.6)
Prior pandemic vaccination No 691 (99) 697 (99.9)
Yes 7 (1) 1 (0.1)
Previous outpatient care No (**) 357 (51.1) 557 (79.7)
Yes (**) 342 (48.9) 142 (20.3)
Previous emergency care No (**) 488 (69.8) 603 (86.3)
Yes (**) 211 (30.2) 96 (13.7)

(*) 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

Open Data