Study protocol for comparing Screening, Brief Intervention, and Referral to Treatment (SBIRT) to referral as usual for depression in African American churches

Table 6 PHQ-9 screening measure effect sizes

ρ (average correlation)	Linear method n = 300; n = 240 per group	Nonlinear method n = 300; n = 240 per group
ρ = 0.5	1.41 (0.30) 1.53 (0.325)	1.23 (0.262) 1.33 (0.281)
ρ = 0.6	1.27 (0.27) 1.36 (0.290)	1.27 (0.270) 1.37 (0.290)

ISSN: 1745-6215