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Table 3 Reported rates of risk behaviours at each date and age- and social class-adjusted ORs for 2003 compared with 1990.

From: Changes in the socio-demographic patterning of late adolescent health risk behaviours during the 1990s: analysis of two West of Scotland cohort studies

  1990 2003 1990 2003 Unadjusted Adjusted for age Adjusted for social class Adjusted for age and social class
  n/N n/N %
(95%CI)
%
(95%CI)
OR
(95% CI)
p-value OR
(95% CI)
p-value OR
(95% CI)
p-value OR
(95% CI)
p-value
Current smoker 300/892 319/939 33.6
(30.6-36.8)
34.0
(31.0-37.1)
1.02
(0.84-1.23)
0.872 0.85
0.67-1.08)
0.181 1.02
(0.84-1.24)
0.825 0.88
(0.69-1.13)
0.323
Heavier smoking * 200/891 145/940 22.5
(19.8-25.3)
15.4
(13.3-17.9)
0.63
(0.50-0.80)
< 0.001 0.57
(0.42-0.77)
< 0.001 0.63
(0.50-0.80)
< 0.001 0.60
(0.44-0.81)
0.001
Excessive drinking 183/892 301/926 20.5
(18.0-23.3)
32.5
(29.6-35.6)
1.87
(1.51-2.31)
< 0.001 1.99
(1.53-2.58)
< 0.001 1.87
(1.51-2.31)
< 0.001 1.96
(1.51-2.55)
< 0.001
Binge drinking 308/891 427/927 34.6
(31.5-37.8)
46.1
(42.9-49.3)
1.62
(1.34-1.95)
< 0.001 1.76
(1.40-2.23)
< 0.001 1.62
(1.34-1.95)
< 0.001 1.77
(1.40-2.24)
< 0.001
Use of any drugs 291/892 553/941 32.6
(29.6-35.8)
58.8
(55.6-61.9)
2.94
(2.43-3.56)
< 0.001 2.62
(2.07-3.31)
< 0.001 2.95
(2.44-3.58)
< 0.001 2.66
(2.10-3.37)
< 0.001
Used any drug in the past year 216/891 375/940 24.2
(21.5-27.2)
39.9
(36.8-43.1)
2.07
(1.69-2.53)
< 0.001 2.11
(1.65-2.70)
< 0.001 2.07
(1.69-2.53)
< 0.001 2.09
(1.63-2.68)
< 0.001
Used cannabis only in the past year (cannabis only) ^ 128/890 230/941 14.4
(12.2-16.8)
24.4
(21.8-27.3)
1.92
(1.51-2.44)
< 0.001 2.19
(1.64-2.93)
< 0.001 1.92
(1.51-2.43)
< 0.001 2.13
(1.59-2.85)
< 0.001
Used any other drug in the past year ('other drugs') ~ 87/891 146/941 9.8
(8.0-11.9)
15.5
(13.4-18.0)
1.69
(1.28-2.25)
< 0.001 1.46
(1.03-2.06)
0.033 1.70
(1.28-2.26)
< 0.001 1.49
(1.05-2.11)
0.024
Early sexual initiation # 139/889 267/938 15.6
(13.4-18.2)
28.5
(25.7-31.4)
2.15
(1.71-2.71)
< 0.001 N/A 2.19
(1.74-2.76)
< 0.001 N/A
Three or more sexual partners ever 212/887 464/925 23.9
(21.2-26.8)
50.2
(46.9-53.4)
3.21
(2.63-3.93)
< 0.001 2.15
(1.68-2.74)
< 0.001 3.31
(2.70-4.05)
< 0.001 2.28
(1.78-2.92)
< 0.001
Two or more sexual partners last year 158/890 331/934 17.8
(15.4-20.4)
35.4
(32.4-38.6)
2.54
(2.04-3.16)
< 0.001 2.11
(1.62-2.75)
< 0.001 2.57
(2.06-3.19)
< 0.001 2.18
(1.67-2.85)
< 0.001
Ever (made) pregnant 53/886 81/935 6.0
(4.6-7.7)
8.7
(7.0-10.6)
1.51
(1.05-2.16)
0.026 0.90
(0.57-1.41)
0.643 1.53
(1.07-2.20)
0.021 0.97
(0.61-1.53)
0.885
  1. * Defined as smoking 70+ cigarettes a week
  2. Defined as ≥22 units in the past week for men and ≥15 units in the past week for women
  3. Defined as ≥9 units on any day in the past week for men and ≥7 units on any day in the past week for women
  4. ^Defined as cannabis and no other drugs
  5. ~ Defined as any other drug(s) (with or without cannabis)
  6. # Defiined as sexual intercourse at age < 16 years
  7. Data on early sexual initiation collected retrospectively so adjustment for age when interviewed not applicable
  8. OR = odds ratio for increase in behaviour rate between 1990 and 2003, CI = confidence interval, N/A = not applicable