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. 2013 Dec 6;8(12):e80869. doi: 10.1371/journal.pone.0080869

Table 2. Parental characteristics of analyzed cohort vs. non-eligible subjects.

Analyzed cohort Non-eligible
N = 218,820 N = 209,273
N % N %
Parental education
Post-graduate 2,838 1.3 2,506 1.2
Post-secondary ≥3 years 41,479 19.0 34,392 16.4
Post-secondary <3 years 36,947 16.9 30,525 14.6
Upper secondary 3 years 31,989 14.6 26,625 12.7
Upper secondary ≤2 years 59,986 27.4 58,421 27.9
Primary/secondary 9–10 years 24,511 11.2 24,475 11.7
Primary/secondary <9 years 12,247 5.6 11,424 5.5
Unspecified 8,823 4.0 20,900 10.0
Missing 0 0 5 <0.1
Socio Economic Index (SIE)
Self-employed professionals 10,111 4.6 7,146 3.4
Professionals/higher non-manual employees 35,948 16.4 28,910 13.8
Entrepreneurs 16,871 7.7 14,848 7.1
Intermediate non-manual employees 52,830 24.1 40,977 19.6
Assistant non-manual employees, lower level 19,788 9.0 16,103 7.7
Assistant non-manual employees, higher level 6,438 2.9 5,646 2.7
Skilled employees in goods production 27,978 12.8 26,750 12.8
Skilled employees in service production 7,675 3.5 7,668 3.7
Unskilled employees in goods production 12,032 5.5 13,557 6.5
Unskilled employees in service production 15,020 6.9 16,939 8.1
Farmers 5,638 2.6 4,062 1.9
Non-classified employees 4,155 1.9 5,565 2.7
Non-active gainfully employed 2,865 1.3 7,522 3.6
Missing 1,471 0.7 13,580 6.5
Parental Income
High 96,400 44.1 72,258 34.5
Medium 104,237 47.6 97,511 46.6
Low 10,959 5.0 18,054 8.6
Missing 7,224 3.3 21,450 10.2