Table 1

Descriptive statistics of variables used in analysis

Full sampleSibling sample
Log earnings
 Mean12.7212.77
 SD0.870.83
Mental health variables
 Total problems
  Mean1.601.58
  SD0.350.33
 Internalising problems (SCL-5)
  Mean1.451.43
  SD0.490.46
 Attention problems index
  Mean1.991.98
  SD0.560.55
 Conduct problems index
  Mean1.361.34
  SD0.360.34
Birth year
 Mean1979.961979.88
 SD1.851.91
Sibship size
 Mean1.831.97
 SD0.820.75
First born39.3%34.5%
Female50.1%50.6%
Parental divorce or separation20.2%15.2%
Immigrant background0.8%0.8%
Parental education
 Less than upper secondary41.0%36.2%
 Vocational upper secondary18.1%17.3%
 Academic upper secondary8.2%8.7%
 University, short25.0%27.6%
 University, long7.7%10.2%
Number of individuals78852637
  • SDs are not shown for discrete variables, as the full distribution of responses is shown. Sibling sample includes respondents in families where at least two full siblings participated in the survey.

  • SCL-5, Hopkins Symptoms Checklist-5.