Table 1.
Risk factors for high titres (⩾75 IU/ml) in sera collected in Health2006 between 2006 and 2008
| Number of seropositive/total | Sera (%) ⩾75 IU/ml (95% CI) | OR (95% CI) | ||
|---|---|---|---|---|
| Univariable analysis | Multivariable analysis | |||
| Total | 102/3440 | 3·0 (2·4–3·6) | ||
| Gender | ||||
| Female | 49/1895 | 2·6 (2·0–3·4) | Ref. | Ref. |
| Male | 53/1545 | 3·4 (2·6–4·5) | 1·34 (0·90–1·99) | 1·25 (0·83–1·87) |
| Age (years) | ||||
| 19–29 | 12/285 | 4·2 (2·4–7·3) | Ref.* | Ref.* |
| 30–39 | 8/495 | 1·6 (0·8–3·2) | 0·37 (0·15–0·93) | 0·39 (0·14–1·07) |
| 40–49 | 38/864 | 4·4 (3·2–6·0) | 1·05 (0·54–2·03) | 1·14 (0·52–2·49) |
| 50–59 | 19/857 | 2·2 (1·4–3·5) | 0·52 (0·25–1·08) | 0·36 (0·14–0·87) |
| 60–72 | 25/940 | 2·7 (1·8–3·9) | 0·62 (0·31–1·25) | 0·49 (0·20–1·21) |
| Education† | ||||
| No education | 18/451 | 4·0 (2·5–6·3) | Ref.* | Ref.* |
| <1 year | 7/216 | 3·2 (1·6–6·6) | 0·81 (0·33–1·96) | 0·98 (0·39–2·46) |
| Craft | 33/1115 | 3·0 (2·1–4·1) | 0·73 (0·41–1·32) | 0·86 (0·45–1·64) |
| <3 years (short) | 10/571 | 1·8 (0·9–3·2) | 0·43 (0·20–0·94) | 0·51 (0·22–1·16) |
| 3–4 years (medium) | 16/725 | 2·2 (1·4–3·6) | 0·54 (0·27–1·08) | 0·36 (0·14–0·87) |
| >4 years (long) | 18/336 | 5·4 (3·0–7·8) | 1·36 (0·70–2·66) | 1·64 (0·78–3·46) |
| Employment status | ||||
| Formerly/never employed | 25/888 | 2·8 (1·9–4·1) | Ref. | Ref. |
| Employed | 76/2499 | 3·0 (2·4–3·8) | 1·08 (0·68–1·71) | 1·07 (0·58–1·95) |
| Type of residence | ||||
| Apartment | 29/956 | 3·0 (2·1–4·3) | Ref. | Ref. |
| House | 49/1617 | 3·0 (2·3–4·0) | 1·00 (0·63–1·59) | 0·96 (0·48–1·95) |
| Terrace house | 21/772 | 2·7 (1·8–4·1) | 0·89 (0·51–1·58) | 1·45 (0·32–6·52) |
| Other | 2/49 | 4·1 (1·0–14·9) | 1·36 (0·32–5·87) | 1·01 (0·53–1·96) |
| Living area (m2) | ||||
| <70 | 11/363 | 3·0 (1·7–5·4) | Ref. | Ref. |
| 70–110 | 38/1361 | 2·8 (2·0–3·8) | 0·92 (0·47–1·82) | 0·61 (0·25–1·47) |
| >110 | 53/1683 | 3·2 (2·4–4·1) | 1·04 (0·54–2·01) | 1·22 (0·68–2·19) |
| Number of persons in home | ||||
| 1 | 16/502 | 3·2 (2·0–5·1) | Ref. | Ref. |
| 2–3 | 48/1580 | 3·0 (2·3–4·0) | 0·95 (0·54–1·69) | 0·82 (0·41–1·61) |
| 4–12 | 38/1330 | 2·9 (2·1–3·9) | 0·80 (0·49–1·62) | 0·49 (0·22–1·09) |
| Smoking | ||||
| Never | 46/1419 | 3·2 (2·4–4·3) | Ref | Ref. |
| Ex-smoker | 29/1111 | 2·6 (1·8–3·7) | 0·80 (0·50–1·28) | 0·86 (0·52–1·42) |
| Smoker | 27/876 | 3·1 (2·1–4·5) | 0·95(0·59–1·54) | 1·01 (0·61–1·68) |
| Alcohol consumption (drinks per week) | ||||
| 0 | 18/481 | 3·7 (2·4–5·9) | Ref. | Ref. |
| 1–13 | 53/2151 | 2·5 (1·9–3·2) | 0·65 (0·38–1·12) | 0·52 (0·30–0·92) |
| 14–21 | 20/481 | 4·2 (2·7–6·4) | 1·12 (0·58–2·14) | 0·87 (0·42–1·77) |
| >21 | 10/301 | 3·3 (1·8–6·1) | 0·88 (0·40–1·94) | 0·74 (0·32–1·72) |
| Asthma | ||||
| No | 94/3019 | 3·1 (2·6–3·8) | Ref. | Ref. |
| Yes | 6/366 | 1·6 (0·7–3·6) | 0·52 (0·23–1·19) | 0·55 (0·23–1·27) |
OR, Odds ratio; CI, confidence interval.
*
Significant (P < 0·05).
†
Education is based on type and length of education after primary school (<16 years). If education was marked as ‘other’ it was either classified after length of education or as missing.