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Table 5 Comparing those with and without common mental health problems within the four study populations

From: Detecting referral and selection bias by the anonymous linkage of practice, hospital and clinic data using Secure and Private Record Linkage (SAPREL): case study from the evaluation of the Improved Access to Psychological Therapy (IAPT) service

  In-depth study population Referred to IAPT Hospital adult population GP listed adult population
People with NO record of Common Mental Health Problem (CMHP):
% of population 10.80% 30.80% 85.20% 89.90%
Age (SEM) 49.3 (3.4) 40.2 (0.74) 46.5 (0.05) 42.3 (0.05)
Gender (F%: M%) 61.1%: 38.9% 55.8%: 44.2% 55.0%: 45.0% 47.7%: 53.3%
IMD (SEM) 36.8% (3.2) 40.4 (0.72) 37.6 (0.07) 37.7 (0.04)
People with a Common Mental Health Problem (CMHP):
% of population 89.20% 69.20% 14.80% 10.10%
Age (SEM) 42.4 (1.1) 40.2 (0.46) 44.7 (0.19) 43.6 (0.15)
Gender (F%: M%) 75.7%: 24.3% 70.0%: 30.0% 69.7%: 30.5% 67.4%: 32.6%
IMD (SEM) 35.5 (1.3) 38.0 (0.53) 38.1 (0.17) 37.6 (0.13)
Total population size and differences between people with and without a CMHP
Total population size 100% 100% 100% 100%
  (n = 166) (n = 1,118) (n = 53,318) (n = 121,199)
Age difference -6.9 years None -1.8 years + 1.5 years
(Significance t-test) (p < 0.05) (n.s.) (p < 0.001) (p < 0.001)
Gender differences 14.60% 14.20% 14.70% 19.70%
(Pearson Chi-square) (p < 0.001) (p < 0.001) (p < 0.001) (p < 0.001)
IMD difference -1.3 -2.4 0.5 -0.1
(Significance t-test) (n.s) (p < 0.05) (p < 0.01) (n.s.)