Table 4.
Relationship Between PHQ-9 Depression Score and SF-20 Health-related Quality of Life Scales*
| Mean (95% CI) SF-20 Scale Score | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Mental | Social | Role | General | Pain | Physical | |||||||
| Level of Depression Severity, PHQ-9 Score | Primary Care | Ob-gyn | Primary Care | Ob-gyn | Primary Care | Ob-gyn | Primary Care | Ob-gyn | Primary Care | Ob-gyn | Primary Care | Ob-gyn |
| Minimal, 1–4 | 81 (80 to 82) | 81 (80 to 82) | 92 (91 to 93) | 91 (90 to 92) | 86 (84 to 88) | 88 (87 to 90) | 70 (69 to 71) | 75 (73 to 76) | 66 (65 to 68) | 73 (72 to 74) | 83 (81 to 83) | 86 (85 to 87) |
| Mild, 5–9 | 65 (64 to 66) | 66 (64 to 67) | 77 (75 to 79) | 81 (79 to 83) | 63 (60 to 66) | 77 (74 to 79) | 50 (48 to 52) | 57 (55 to 58) | 52a (50 to 54) | 59a (57 to 61) | 69 (67 to 71) | 76a (74 to 77) |
| Moderate, 10–14 | 51 (50 to 53) | 53 (51 to 55) | 65 (62 to 68) | 75a (72 to 78) | 53a (49 to 58) | 64a (60 to 69) | 40a (37 to 43) | 48 (45 to 51) | 49a (45 to 52) | 53a,b(50 to 57) | 63a(60 to 66) | 74a(71 to 77) |
| Moderately severe, 15–19 | 43 (40 to 45) | 45 (42 to 48) | 55 (51 to 59) | 68a (63 to 72) | 42a (36 to 48) | 64a,b (57 to 71) | 33a,b (29 to 37) | 40a (35 to 44) | 45a,b (41 to 50) | 50b (45 to 55) | 57a,b (53 to 61) | 74a (69 to 78) |
| Severe, 20–27 | 29 (25 to 31) | 35 (31 to 39) | 40 (35 to 44) | 50 (43 to 56) | 27 (20 to 35) | 48b (39 to 58) | 27b (22 to 31) | 30a (24 to 36) | 40b (35 to 45) | 46b (40 to 53) | 53b (48 to57) | 56 (50 to 62) |
*
SF-20 scores are adjusted for age, gender, race, education, study site, and number of physical disorders. Pointestimates for the mean as well as 95% confidence intervals (±1.96 × standard error of the mean) are displayed.
Most pairwise comparisons of mean SF-20 scores between each PHQ-9 level within each scale are significant at P < 0.05 using Bonferroni's correction for multiple comparisons. Only those pairwise comparisons that share a common superscript letter (a, b, or a,b) are not significant.