Table 2.
Prevalence of respiratory symptoms and diseases and distribution of lung function parameters and confounding variablesa
| ECRHS I | ECRHS II | ECRHS III | ||||
|---|---|---|---|---|---|---|
| SHS exposed (n = 1164) | SHS non-exposed (n = 1847) | SHS exposed (n = 694) | SHS non-exposed (n = 2317) | SHS exposed (n = 215) | SHS non-exposed (n = 2796) | |
| Sex, female | 52.0 (605/1164) | 55.5 (1025/1847) | 51.9 (360/694) | 54.8 (1270/2317) | 58.6 (126/215) | 53.8 (1504/2796) |
| Age, years | 33.8 (7.5) | 35.1 (6.9) | 43.5 (7.3) | 43.3 (7.1) | 53.8 (6.9) | 54.7 (7.2) |
| Age completed full time education | ||||||
| < 17 years | 19.4 (212/1093) | 13.8 (232/1686) | 24.7 (160/649) | 13.3 (284/2130) | 29.6 (59/199) | 14.9 (385/2580) |
| 17–20 years | 39.1 (427/1093) | 33.6 (567/1686) | 39.8 (258/649) | 34.6 (736/2130) | 39.7 (79/199) | 35.5 (915/2580) |
| > 20 years | 41.5 (454/1093) | 52.6 (887/1686) | 35.6 (231/649) | 52.1 (1110/2130) | 30.7 (61/199) | 49.6 (1280/2580) |
| Height, cm | 170.4 (9.8) | 170.6 (9.5) | 169.6 (10.0) | 170.9 (9.5) | 167.2 (10.2) | 170.1 (9.7) |
| Weight, kg | 70.2 (14.0) | 68.7 (13.2) | 74.5 (15.0) | 73.6 (14.9) | 77.7 (14.2) | 77.6 (16.1) |
| Paternal smoking | 63.3 (714/1128) | 58.2 (1059/1819) | 67.2 (452/673) | 58.1 (1321/2274) | 72.9 (153/210) | 59.2 (1620/2737) |
| Maternal smoking | 20.5 (237/1155) | 20.3 (373/1834) | 17.8 (123/690) | 21.2 (487/2299) | 18.2 (39/214) | 20.6 (571/2775) |
| Allergic sensitisation, IgE | 26.5 (267/1007) | 33.8 (538/1593) | 26.0 (151/581) | 32.4 (654/2019) | 28.4 (50/176) | 31.1 (755/2424) |
| Dust/fumes exposure | 41.8 (484/1159) | 35.7 (653/1828) | 42.7 (296/694) | 39.0 (904/2316) | 38.5 (77/200) | 22.1 (572/2583) |
| Ex-smoker | 31.2 (363/1164) | 28.7 (531/1847) | 33.3 (231/694) | 29.5 (684/2317) | 31.6 (68/215) | 29.0 (810/2796) |
| Smoking status | ||||||
| Never smoker | 69.2 (801/1158) | 71.4 (1316/1844) | 67.9 (463/682) | 73.0 (1633/2236) | 70.0 (147/210) | 73.3 (1986/2709) |
| Ex-smoker with < 15 pack-years | 23.2 (269/1158) | 22.3 (412/1844) | 21.6 (147/682) | 21.2 (474/2236) | 16.2 (34/210) | 20.1 (544/2709) |
| Ex-smoker with > = 15 pack-years | 7.6 (88/1158) | 6.3 (116/1844) | 10.6 (72/682) | 5.8 (129/2236) | 13.8 (29/210) | 6.6 (179/2709) |
| Asthma, doctor-diagnosed | 7.1 (82/1160) | 7.4 (136/1846) | 10.4 (72/694) | 10.8 (250/2312) | 15.0 (32/213) | 13.8 (385/2792) |
| Chronic bronchitis | 1.4 (16/1162) | 1.3 (24/1846) | 2.3 (16/693) | 1.2 (27/2314) | 4.2 (9/215) | 2.1 (59/2789) |
| COPD, FEV1/FVC < 0.7 | 2.7 (29/1078) | 3.4 (59/1731) | 2.5 (16/630) | 4.4 (89/2042) | 9.3 (18/193) | 10.8 (264/2448) |
| COPD, FEV1/FVC < GLI LLN | 4.6 (50/1077) | 4.5 (78/1731) | 2.2 (14/629) | 3.8 (77/2038) | 5.7 (11/193) | 5.8 (142/2445) |
| Asthma symptom score | ||||||
| 0 | 74.8 (866/1157) | 76.0 (1392/1831) | 67.9 (468/689) | 75.0 (1723/2298) | 65.6 (137/209) | 72.7 (1974/2714) |
| 1 | 14.1 (163/1157) | 13.0 (238/1831) | 18.3 (126/689) | 13.6 (313/2298) | 16.7 (35/209) | 16.8 (455/2714) |
| 2 | 5.7 (66/1157) | 5.4 (99/1831) | 6.7 (46/689) | 5.9 (136/2298) | 7.7 (16/209) | 6.0 (163/2714) |
| 3 | 2.9 (33/1157) | 2.8 (51/1831) | 3.5 (24/689) | 3.1 (72/2298) | 4.8 (10/209) | 2.5 (67/2714) |
| 4 | 1.6 (18/1157) | 1.6 (30/1831) | 2.5 (17/689) | 1.6 (36/2298) | 3.3 (7/209) | 1.0 (26/2714) |
| 5 | 1.0 (11/1157) | 1.1 (21/1831) | 1.2 (8/689) | 0.8 (18/2298) | 1.9 (4/209) | 1.1 (29/2714) |
| Dyspnoea | 4.6 (54/1163) | 4.9 (90/1847) | 6.5 (45/694) | 5.2 (120/2310) | 9.0 (19/211) | 5.2 (142/2743) |
| Cough | 33.6 (390/1159) | 29.7 (547/1842) | 35.3 (244/692) | 31.7 (733/2312) | 40.1 (85/212) | 33.7 (936/2778) |
| Sputum | 11.2 (129/1153) | 10.1 (185/1827) | 12.0 (83/692) | 10.0 (230/2298) | 15.2 (32/211) | 10.9 (302/2769) |
| FEV1, ml | 3800 (824) | 3781 (835) | 3522 (805) | 3595 (819) | 3028 (756) | 3123 (778) |
| FVC, ml | 4573 (1032) | 4591 (1058) | 4306 (1000) | 4458(1030) | 3904 (995) | 4063 (993) |
| FEV1/FVC, % | 83.5 (6.7) | 82.8 (6.5) | 82.1 (5.9) | 80.9 (6.1) | 77.6 (5.6) | 77.0 (5.7) |
astratified by exposure to second-hand smoke (SHS) and presented as % (n/N) for categorical variables and mean (SD) for continuous variables, respectively