Skip to main content

Table 2 Sample descriptive statisticsa

From: Young adult cancer risk behaviours originate in adolescence: a longitudinal analysis using ALSPAC, a UK birth cohort study

Outcome measures Available case sample by variable Complete case sample 1951 Imputation sample 6351
n (%) % (SE for the percentage)
Harmful alcohol (Yes) 3167 273 (18.9%) 16% (0.6)
No   1169 (81.1%) 84% (0.6)
Daily smoking (Yes) 3195 121 (8.3%) 14% (0.6)
No   1330 (91.7%) 86% (0.6)
Nicotine dependence (Yes) 3193 50 (3.5%) 6% (0.4)
No   1400 (96.6%) 94% (0.4)
Obesity (Yes) 3202 183 (12.6%) 11% (0.5)
No   1270 (88%) 89% (0.5)
High waist circumference (Yes) 3194 411 (28.3%) 29% (0.7)
No   1042 (71.7%) 71% (0.7)
High waist-hip ratio (Yes) 3194 114 (7.9%) 10% (0.4)
No   1339 (92.2%) 90% (0.4)
Exposure measure
 Cancer Risk Exposure AUC (0–21) 1951   
 Mean (SD)   9.57 (4.21) 9.72 (3.98)
 Median (IQR)   8.75 (6.5–12) 9.63 (6.6–12.1)
Confounder measures
 Sex 6351   
  Female   1171 (60%) 52% (0.6)
  Male   780 (40%) 48% (0.6)
 Maternal education 5540   
  Degree   458 (24%) 17% (0.5)
  A level   562 (29%) 28% (0.6
  O level   632 (33%) 35% (0.6)
   < O level   271 (14%) 20% (0.5)
 Parental socioeconomic position 5319   
  Professional   401 (21%) 17% (0.5)
  Managerial and technical   886 (47%) 45% (0.7)
  Skilled non-man   417 (22%) 24% (0.6)
  Skilled man, part or unskilled   169 (9%) 14% (0.5)
 Housing tenure 6169   
  Mortgage/owned   1704 (89%) 84% (0.5)
  Private rent   91 (5%) 8% (0.4)
  Subsidised rent   127 (7%) 8% (0.3)
 Income 5105   
  High   490 (27%) 24% (0.6)
  Mid-high   454 (25%) 22% (0.6)
  Middle   394 (22%) 21% (0.6)
  Mid-low   305 (17%) 19% (0.6)
  Low   183 (10%) 15% (0.5)
 IQ: mean (SD) 5433 109.8 (16.18) 105.4 (17.53)
Maternal smoking 5342 218 (12%) 18% (0.5)
 No   1632 (88%) 82% (0.5)
Harmful maternal alcohol consumption 5170 481 (27%) 25% (0.6)
No   1321 (73%) 75% (0.6)
Maternal cannabis use 5377 58 (3%) 4% (0.3)
 No   1798 (97%) 96% (0.3)
Maternal physical activity (hrs per week): mean (SD) 5604 3.35 (5.38) Mean = 3.96 (6.38)
Birthweight: mean (SD) 5347 3437.5 (507.6) Mean = 3440 (559.45)
Gestational age: mean (SD) 5347 276.8 (11.9) Mean = 276.2 (13.55)
Maternal unhealthy diet: mean (SD) 5201 0.03 (0.79) Mean = 0.08 (0.80)
Child depressive symptoms short moods and feelings questionnaire (SMFQ): mean (SD) 5347 2.27 (2.93) Mean = 2.47 (3.19)
Child antisocial behaviour: mean (SD) 5276 0.26 (0.68) Mean = 0.34 (0.80)
Child total difficulties score strengths and difficulties questionnaire (SDQ): mean (SD) 5459 6.00 (4.42) Mean = 6.58 (4.78)
Adverse childhood experiences (ACEs): mean (SD) 3396 1.03 (1.21) Mean = 1.31 (1.59)
Maternal Body mass index (BMI): mean (SD) 5749 22.59 (3.52) Mean = 22.88 (3.98)
  1. aTo calculate the number of cases missing in the imputation sample, subtract the available case sample by variable from 6351
  2. SD standard deviation, IQR inter quartile range, SE standard error
\