Table 2.

Prevalence and prevalence rate ratios of potential mental health problems.in adulthood by borderline intellectual functioning status and age (only childhood adversity imputed).

	Age 26	Age 30	Age 34	Age 42
Borderline intellectual functioning prevalence (with 95% CI)	17.0% (14.5–19.8%)	16.7% (14.5–19.8%)	19.6% (17.2–22.2%)	22.0% (19.3–25.0%)
Higher estimated IQ prevalence (with 95% CI)	12.7% (11.9–13.5%)	11.6% (10.9–12.3%)	14.4% (13.6–15.2%)	17.6% (16.6–18.5%)
Model 1: Unadjusted prevalence rate ratio (with 95% CI)	1.34 (1.13–1.59)	1.44 (1.25–1.66)	1.36 (1.18–1.57)	1.26 (1.09–1.45)
P value	< 0.01	< 0.001	< 0.001	< 0.01
Model 2: Prevalence rate ratio adjusted for participant gender	1.37 (1.16–1.61)	1.45 (1.26–1.68)	1.38 (1.20–1.59)	1.26 (1.09–1.45)
P value	< 0.001	< 0.001	< 0.001	< 0.01
Model 3: Prevalence rate ratio adjusted for participant gender and exposure to childhood adversities	1.12 (0.94–1.32)	1.21 (1.04–1.40)	1.17 (1.01–1.35)	1.10 (0.95–1.27)
P value	n.s.	< 0.05	< 0.05	n.s.
Model 4: Significance of BIF status by childhood adversities associated with material and/or social deprivation	n.s	n.s	n.s	n.s

Notes: CI = Confidence interval, n.s. = not significant at alpha p < 0.05