Adjusted odds ratios (ORs), by area, sex, age and smoking status for asthma symptoms among immigrants and emigrants compared to non-migrants (reference group), by country
| Country | Asthma no:yes | OR (95% CI) | |||
| Nonmigrants | Immigrants | Emigrants | Immigrants | Emigrants | |
| Australia | 478:54 | 114:23 | 17:3 | 2.18 (1.25–3.80)* | 1.59 (0.44–5.70) |
| Belgium | 1004:73 | 37:5 | 14:0 | 1.86 (0.70–4.94) | nc |
| Denmark | 338:34 | 21:1 | 9:0 | 0.54 (0.07–4.27) | nc |
| France | 1660:206 | 226:33 | 24:5 | 1.33 (0.89–2.00) | 1.77 (0.66–4.73) |
| Germany | 1828:111 | 41:3 | 82:11 | 1.27 (0.38–4.17) | 2.08 (1.07–4.05)* |
| Iceland | 531:17 | 11:0 | 3:0 | nc | nc |
| Ireland | 371:39 | 26:2 | 10:1 | 0.71 (0.16–3.18) | 1.10 (0.13–9.51) |
| Italy | 800:82 | 10:2 | 63:6 | 2.14 (0.45–10.23) | 0.85 (0.35–2.07) |
| Netherlands | 1123:70 | 49:3 | 22:2 | 1.16 (0.35–3.87) | 1.39 (0.31–6.20) |
| New Zealand | 868:143 | 211:31 | 6:5 | 1.03 (0.63–1.69) | 6.10 (1.79–20.69)* |
| Norway | 736:48 | 46:5 | 16:2 | 1.71 (0.64–4.58) | 1.99 (0.44–9.04) |
| Spain | 1774:128 | 34:4 | 28:3 | 1.69 (0.59–4.87) | 1.32 (0.39–4.45) |
| Sweden | 1515:135 | 188:18 | 14:0 | 1.09 (0.65–1.83) | nc |
| Switzerland | 606:56 | 168:23 | 11:0 | 1.56 (0.93–2.63) # | nc |
| UK | 1278:183 | 79:7 | 159:19 | 0.63 (0.28–1.38) | 0.87 (0.51–1.46) |
| USA | 461:60 | 32:3 | 28:5 | 0.67 (0.20–2.28) | 1.38 (0.50–3.77) |
| Total | 15371:1439 | 1293:163 | 501:62 | 1.21 (1.00–1.51)* | 1.31 (0.96–1.78)# |
CI: confidence interval
nc: model did not achieve convergence due to lack of migrants
*: p<0.05
#: p<0.1