Percentage of households and odds ratios by social class of head of household and ambient air quality index (health survey for England, 1995–97)
| Social class of head of household* | Ambient air quality index | Odds ratio | 95% Confidence intervals | p Value | ||
|---|---|---|---|---|---|---|
| Good(quintiles 1–3) | Poor(quintiles 4–5) | Total | ||||
| *I and II: Professional and managerial occupations; IIIN and IIIM: semi-skilled non-manual and manual; IV and V: semi-skilled and unskilled. | ||||||
| Households (% in air quality quintile) | ||||||
| Urban and urban fringe | ||||||
| I and II | 2278 (32.6) | 4720 (67.5) | 6998 (100.0) | 1 | – | – |
| IIIN and IIIM | 2699 (28.2) | 6879 (71.8) | 9578 (100.0) | 1.23 | 1.15, 1.32 | <0.001 |
| IV and V | 1300 (26.8) | 3545 (73.2) | 4845 (100.0) | 1.32 | 1.21, 1.43 | <0.001 |
| Total | 6277 (29.3) | 15144 (70.7) | 21421 (100.0) | p value for trend | <0.001 | |
| Rural and semi-rural | ||||||
| I and II | 1435 (93.8) | 95 (6.2) | 1530 (100.0) | 1 | – | – |
| IIIN and IIIM | 1042 (94.2) | 64 (5.8) | 1106 (100.0) | 0.93 | 0.67, 1.29 | 0.653 |
| IV and V | 519 (95.2) | 26 (4.8) | 545 (100.0) | 0.76 | 0.48, 1.18 | 0.220 |
| Total | 2996 (94.2) | 185 (5.8) | 3181 (100.0) | p value for trend | 0.230 | |