Table 2.

Educational difference between highest level of parental education and subject education

	n	Mean (SD)	B (p)a	CI	B linear trend (p)b	CI
Group
Controls	315	−1.14 (1.57)
Siblings	510	−0.47 (1.61)	0.49 (0.001)	0.21 to 0.76
Patients	581	−0.25 (1.75)	0.77 (<0.001)	0.48 to 1.06	0.36 (<0.001)	0.21 to 0.50
Childhood trauma
Low	497	−0.73 (1.56)
Medium	364	−0.61 (1.61)	0.07 (0.56)	−0.16 to 0.30
High	416	−0.46 (1.67)	0.12 (0.34)	−0.12 to 0.36	0.07 (0.279)	−0.05 to 0.19
Urbanicityc
Level 1	462	−0.82 (1.67)
Level 2	321	−0.47 (1.61)	0.43 (0.002)	0.16 to 0.71
Level 3	159	−0.17 (1.66)	0.68 (<0.001)	0.33 to 1.03
Level 4	173	−0.47 (1.61)	0.49 (0.007)	0.13 to 0.84
Level 5	335	−0.58 (1.72)	0.46 (0.002)	0.17 to 0.74	0.11 (0.002)	0.04 to 0.18

B represents the regression coefficients from multilevel linear regression analyses, adjusted for age, sex, and ethnicity

SD standard deviation, CI 95 % confidence interval

^aModel 1: all independent variables entered as categorical variables recoded into dummy variables

^bModel 2: all independent variables entered as categorical variables comprised in a linear model

^cFive levels of urbanicity/population density 1 <500 inhabitants/km²; 2 500–1000 inhabitants/km²; 3 inhabitants 1000–1500/km²; 4 inhabitants 1500–2500/km²; 5 2500+/km