Table 1

Sociodemographic and clinical characteristics at age 7 of the middle-aged TAHS participants who formed the study sample for the current analysis

Childhood clinical characteristic in 1968TAHS participants attending follow-up at age 53 (N=3202 (%))*
None (n=1680 (52.5%))Chronic bronchitis groups at age 7 yearsP trend
Non-recurrent
(n=902 (28.1%))
Recurrent, non-protracted
(n=578 (18.1%))
Recurrent-protracted
(n=42 (1.3%))
Age (years, SD)6.50 (0.3)6.51 (0.3)6.50 (0.3)6.54 (0.3)0.659
Sex (% male)796 (47)432 (48)327 (56)23 (55)0.004
Familial bronchitic symptoms
 One parent only428 (25)317 (35)258 (45)23 (55)<0.001
 Both parents30 (1.8)40 (4.4)47 (8.1)5 (12)<0.001
≥3 Siblings, of any age796 (47)366 (41)211 (36)15 (36)<0.001
Mother who regularly smoked539 (32)313 (35)217 (37)13 (31)0.027
 >5 cigarettes/day436 (26)257 (29)184 (32)7 (17)0.040
Father who regularly smoked1003 (60)501 (56)351 (61)27 (64)0.987
 >5 cigarettes/day882 (52)445 (49)313 (54)24 (57)0.694
Paternal occupation
 Highest SES401 (24)237 (27)150 (26)7 (17)0.118
 Lowest SES212 (13)89 (9.8)73 (13)6 (15)0.196
Remote rurality of school60 (3.6)20 (2.2)16 (2.8)0 (0)0.086
Asthma/wheezing-ever92 (5.5)166 (18)269 (46)25 (60)<0.001
 >5 episodes26 (1.6)27 (3.0)208 (36)17 (44)<0.001
Childhood infections
 Pneumonia and/or pleurisy108 (6.5)153 (17)151 (26)16 (38)<0.001
 Measles (non-immunised)1154 (69)623 (69)379 (65)32 (76)0.423
 Pertussis (non-immunised)30 (1.7)14 (1.6)7 (1.2)0 (0)0.220
 Pertussis (immunised)90 (5.3)79 (8.8)42 (7.3)4 (9.5)0.050
  • *Percentages in brackets compares the prevalence between childhood bronchitis groups.

  • SES, socioeconomic status; TAHS, Tasmanian Longitudinal Health Study.