Table 1.

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

	Age 26	Age 30	Age 34	Age 42
Borderline intellectual functioning prevalence (with 95% CI)	20.7% (17.1–24.8%)	20.8% (17.2–24.9%)	23.5% (19.7–27.8%)	26.2% (22.2–30.6%)
Higher estimated IQ prevalence (with 95% CI)	12.9% (12.3–13.5%)	11.5% (11.0–12.1%)	15.0% (14.4–15.6%)	18.2% (17.5–18.9%)
Model 1: Unadjusted prevalence rate ratio (with 95% CI)	1.60 (1.45–1.76)	1.81 (1.64–1.99)	1.57 (1.44–1.71)	1.45 (1.33–1.56)
P value	< 0.001	< 0.001	< 0.001	< 0.001
Model 2: Prevalence rate ratio adjusted for participant gender	1.63 (1.48–1.79)	1.83 (1.67–2.02)	1.64 (1.50–1.78)	1.46 (1.35–1.58)
P value	< 0.001	< 0.001	< 0.001	< 0.001
Model 3: Prevalence rate ratio adjusted for participant gender and exposure to childhood adversities	1.31 (1.19–1.45)	1.53 (1.38–1.69)	1.35 (1.23–1.47)	1.35 (1.25–1.47)
P value	< 0.001	< 0.001	< 0.001	< 0.001
Model 4: Significance of BIF status by childhood adversities associated with material and/or social deprivation	n.s	n.s	n.s	n.s