Table 1

Summary statistics of individual baseline mortality data in Renfrew/Paisley and Collaborative cohorts

VariablesRenfrew/Paisley (n=15331)Collaborative (n=6680)
Age in years
 Mean (SD)54.3 (5.6)48.1 (6.6)
 Median (LQ, UQ)54 (50, 59)48 (43, 53)
 (min, max)(45, 64)(35, 64)
Gender
 Female (%)8324 (54.3%)987 (14.8%)
 Male (%)7007 (45.7%)5693 (85.2%)
Marital status
 Married (%)12284 (80.1%)5852 (87.6%)
 Other (%)271 (1.8%)60 (0.9%)
 Single (%)1411 (9.2%)582 (8.7%)
 Widowed (%)1365 (8.9%)185 (2.8%)
 Missing (%)0 (0.0%)1 (0.0%)
Social class
 I (high) (%)538 (3.5%)767 (11.5%)
 II (%)2221 (14.5%)1104 (16.5%)
 IIIN (%)2798 (18.3%)1813 (27.1%)
 IIIM (%)4289 (28.0%)1216 (18.2%)
 IV (%)3758 (24.5%)1539 (23.0%)
 V (low) (%)1304 (8.5%)230 (3.4%)
 Missing (%)423 (2.8%)11 (0.2%)
Smoking habits
 Never (%)4983 (32.5%)1343 (20.1%)
 Ex (%)2343 (15.3%)1440 (21.6%)
 1–14 (%)2394 (15.6%)981 (14.7%)
 15–24 (%)4057 (26.5%)1891 (28.3%)
 25+ (%)1407 (9.2%)868 (13.0%)
 Pipe-cigar (%)147 (1.0%)154 (2.3%)
 Missing (%)0 (0.0%)3 (0.0%)
Body mass index (kg/m2)
 Mean (SD)25.8 (4.0)25.1 (3.2)
 Median (LQ, UQ)25.5 (23.1, 28.0)25.0 (23.0, 27.0)
 (min, max)(14.1, 67.9)(15.7, 51.7)
 Missing (%)14 (0.1%)1 (0.0%)
Systolic blood pressure (mm Hg)
 Mean (SD)149.4 (24.4)134.4 (18.2)
 Median (LQ, UQ)146.0 (132.0, 164.0)131.0 (122.0, 143.0)
 (min, max)(80.0, 270.0)(90.0, 257.0)
 Missing (%)7 (0.0%)5 (0.1%)
Cholesterol (mmol/l)
 Mean (SD)6.2 (1.1)5.9 (1.0)
 Median (LQ, UQ)6.1 (5.4,6.8)5.8 (5.2, 6.5)
 (min, max)(1.9, 20.5)(1.9, 11.5)
 Missing (%)137 (0.9%)41 (0.6%)
Deprivation category
 1 (least deprived)967 (6.3%)616 (9.2%)
 20 (0.0%)536 (8.0%)
 32086 (13.6%)966 (14.5%)
 43349 (21.8%)1056 (15.8%)
 55539 (36.1%)1425 (21.3%)
 62765 (18.0%)1370 (20.5%)
 7 (most deprived)625 (4.1%)709 (10.6%)
 Missing (%)0 (0.0%)2 (0.0%)
Specific group causes of death up to end of 1998
 Dead (%)7767 (50.7%)2885 (43.2%)
 Cardiovascular (%)3041 (19.8%)1169 (17.5%)
 Ischaemic heart disease (%)2534 (16.5%)954 (14.3%)
 Respiratory (%)606 (4.0%)178 (2.7%)
 Lung cancer (%)798 (5.2%)288 (4.3%)
Distance from nearest black smoke monitor (km)
 Mean (SD)1.7 (1.1)1.8 (2.3)
 Median (LQ, UQ)1.4 (0.8, 2.6)1.2 (0.7, 2.0)
 (min, max)(0.0, 4.6)(0.0, 69.5)
Predicted black smoke exposure using inverse distance weighted model (IDWBS) (μg m−3) (within 5 km of monitoring sites)
 Mean (SD)23.6 (2.8)22.6 (8.3)
 Median (LQ, UQ)25.2 (21.6, 25.7)21.3 (16.7, 26.8)
 (min, max)(14.9, 27.1)(5.4, 70.0)
 Missing (%)0 (0%)449 (6.7%)
Predicted black smoke exposure using additive model (AMBS) (μg m−3) (within 5 km of monitoring sites)
 Mean (SD)18.8 (2.7)23.0 (7.6)
 Median (LQ, UQ)19.4 (16.8, 20.9)21.5 (17.6, 27.8)
 (min, max)(5.9, 24.4)(6.2, 48.5)
 Missing (%)0 (0%)422 (6.3%)
Predicted black smoke exposure obtained using multi-level model (MultiBS) (μg m−3) (within 5 km of monitoring sites)
 Mean (SD)19.3 (3.9)23.2 (7.5)
 Median (LQ, UQ)19.8 (16.1, 22.4)21.8 (18.3, 26.6)
 (min, max)(6.4, 28.7)(4.6, 55.3)
 Missing (%)0 (0%)364 (5.4%)
  • LQ, lower quartile; max, maximum; min, minimum; UQ, upper quartile.