Table 4

Odds ratios for psychosis-like symptoms (suspected and definite) as linear and quadratic terms before and after adjustmenta

OR (95% CI) Adjusted ORb Adjusted ORc
a. Odds ratios are for an increase of 10 points in the IQ total score.
b. Adjusted for social class, housing tenure, gender, birth weight, family composition, maternal education, urban/rural residence and family history of psychiatric disorder.
c. Further adjusted for bullying (overt and relative) and Strengths and Difficulties Questionnaire total score.
Linear and quadratic (n=3449)
     IQ total score 0.37 (0.21-0.68) 0.39 (0.21-0.71) 0.44 (0.24-0.80)
     Quadratic term (IQ2) 1.04 (1.01-1.07) 1.04 (1.01-1.07) 1.04 (1.01-1.07)
Imputed dataset (n=6751)
     IQ total score 0.49 (0.33-0.74) 0.49 (0.33-0.74) 0.56 (0.37-0.85)
     Quadratic term (IQ2) 1.03 (1.01-1.05) 1.03 (1.01-1.05) 1.03 (1.01-1.05)