Otitis media

Yes

NO

Total

p-value

Odd ratio

95% C.L for EXP (B)

Previous O. complain

Yes

101 (84.2%)

32 (12.1%)

133 (34.6%)

0.000

1.6595

Upper

Lower

NO

19 (15.8%)

232 (87.9%)

251 (65.4%)

2.801

0.518

Recurrent ear infection

Yes

78 (65%)

23 (8.7%)

101 (26.3%)

0.000

1.512

4.520

0.506

NO

42 (35%)

241 (91.3%)

283 (73.7%)

The first episode of ear infection

None

37 (30.9%)

238 (90.2%)

275 (71.6%)

0.000

1.505

1.505

2.512

0 - 6 m

34 (28.3%)

10 (3.8%)

44 (11.5%)

7 - 12 m

40 (33.3%)

13 (4.9%)

53 (13.8%)

13 - 36 m

7 (5.8%)

2 (0.7%)

9 (2.3%)

37 - 59 m

2 (1.7%)

1 (0.4%)

3 (0.8%)