Table 3

Odds ratios for psychosis-like symptoms (suspected and definite) according to IQ total score quintiles before and after adjustmenta

IQ score n (%) 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.
<79 297 (20.2) 1.72 (1.26-2.34) 1.62 (1.10-2.39) 1.55 (1.00-2.39)
80-89 564 (16.7) 1.36 (1.05-1.75) 1.62 (1.21-2.18) 1.38 (0.98-1.94)
90-109 2350 (12.9) 1.0 1.0 1.0
110-119 1081 (11.5) 0.88 (0.70-1.10) 0.99 (0.77-1.28) 1.03 (0.78-1.37)
≥ 120 1036 (11.5) 0.88 (0.70-1.10) 1.05 (0.81-1.37) 1.20 (0.90-1.59)
Total n 5328 (100) 5328 4042 3449