Table 1 Prevalence and prevalence rate ratios of potential mental health problems. in adulthood by borderline intellectual functioning status and age (fully imputed data).

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