Table 4.

Best-fit parsimonious model

	β	SE
Main effects
Intercept	−1.329	1.183
Age	0.325a	0.166
Sex	−0.303	0.239
5HTT	−0.569b	0.187
MAOA	0.046	0.259
Gestation location	−1.263c	0.383
No. of locations	−0.350a	0.172
Nervous	0.344b	0.118
Rearing location	0.355	0.195
Time (d) in hospital	−0.445	0.429
ACTH stimulation	0	0.001
Interaction effects
5HTT × sex	0.684	0.282
MAOA × sex	−0.616	0.315
Gestation location × sex	0.748b	0.279
Gestation location × no. of locations	0.278	0.243
Rearing location × nervous	−0.722c	0.161
Gestation location × time (d) in hospital	0.426	0.429
Gestation location × MAOA	0.786b	0.301
Nervous × ACTH stimulation	0	0.001

5HTT, presence of serotonin transporter gene short allele; MAOA, presence of monoamine oxidase A low-expression gene

Data are presented as β coefficients such that 0.0 indicates no difference associated with that variable. See Figure 2 for complete description of variables.

^aP < 0.05

^bP < 0.01

^cP < 0.001