Table 5.
Risk factor analysis: Odds Ratios with 95% Confidence Intervals from logistic regression models
| |
|
Dependent variables |
|||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| |
|
Chronic productive cough |
Physician-diagnosed asthma |
Recurrent wheeze |
|||||||||
| |
|
Study year 1996 |
Study year 2006 |
Study year 1996 |
Study year 2006 |
Study year 1996 |
Study year 2006 |
||||||
| Independent variables | OR | 95% CI | OR | 95% CI | OR | 95% CI | OR | 95% CI | OR | 95% CI | OR | 95% CI | |
| Age |
20-29 years |
1 |
|
1 |
|
1 |
|
1 |
|
1 |
|
1 |
|
| 30-39 years |
1.14 |
(0.82-1.60) |
0.87 |
(0.59-1.28) |
0.82 |
(0.65-1.05) |
0.78 |
(0.60-1.01) |
1.04 |
(0.83-1.31) |
1.18 |
(0.88-1.58) |
|
| 40-49 years |
1.01 |
(0.73-1.42) |
0.85 |
(0.59-1.22) |
0.60 |
(0.46-0.77) |
0.64 |
(0.50-0.83) |
0.82 |
(0.65-1.04) |
1.07 |
(0.81-1.41) |
|
| 50-59 years |
1.80 |
(1.32-2.47) |
1.07 |
(0.76-1.52) |
0.55 |
(0.42-0.72) |
0.62 |
(0.48-0.80) |
1.03 |
(0.81-1.29) |
1.25 |
(0.96-1.64) |
|
| 60-69 years |
2.59 |
(1.90-3.53) |
1.35 |
(0.95-1.92) |
0.89 |
(0.69-1.15) |
0.60 |
(0.46-0.79) |
1.31 |
(1.04-1.65) |
1.23 |
(0.93-1.63) |
|
| Sex |
Female |
1 |
|
1 |
|
1 |
|
1 |
|
1 |
|
1 |
|
| Male |
1.17 |
(0.98-1.41) |
1.55 |
(1.25-1.92) |
1.05 |
(0.89-1.24) |
0.90 |
(0.77-1.06) |
0.98 |
(0.85-1.13) |
1.19 |
(1.01-1.39) |
|
| Family history of asthma |
No/Don’t know |
1 |
|
1 |
|
1 |
|
1 |
|
1 |
|
1 |
|
| Yes |
1.81 |
(1.49-2.21) |
2.37 |
(1.91-2.95) |
3.26 |
(2.76-3.85) |
3.39 |
(2.88-4.00) |
2.41 |
(2.07-2.79) |
2.71 |
(2.30-3.20) |
|
| Smoking habits |
Non-smokers |
1 |
|
1 |
|
1 |
|
1 |
|
1 |
|
1 |
|
| Ex-smokers |
0.89 |
(0.69-1.14) |
1.17 |
(0.89-1.54) |
1.33 |
(1.09-1.64) |
1.41 |
(1.15-1.72) |
1.34 |
(1.10-1.62) |
1.50 |
(1.22-1.85) |
|
| <5 cig/day |
0.60 |
(0.35-1.02) |
1.41 |
(0.87-2.28) |
1.01 |
(0.70-1.46) |
1.09 |
(0.74-1.61) |
1.70 |
(1.26-2.30) |
2.18 |
(1.55-3.06) |
|
| 5-14 cig/day |
1.43 |
(1.09-1.86) |
1.61 |
(1.14-2.27) |
0.85 |
(0.65-1.12) |
1.33 |
(1.01-1.74) |
2.61 |
(2.14-3.17) |
3.09 |
(2.45-3.91) |
|
| >14 cig/day | 3.07 | (2.35-4.02) | 3.31 | (2.23-4.91) | 0.95 | (0.67-1.34) | 0.68 | (0.41-1.14) | 3.49 | (2.77-4.40) | 3.32 | (2.39-4.63) | |
Statistically significant Odds Ratios (OR) with corresponding 95% Confidence Intervals (CI) are bolded.