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Table 1 Baseline characteristics of different analysis populations

From: Validity of single item responses to short message service texts to monitor depression: an mHealth sub-study of the UK ACUDep trial

Characteristic Total patients in ACUDep trial n = 755 Group 1 Patients with PHQ-9 score at 3 months n = 602 Group 2 Patients with PHQ-9 score at 3 months & R-SMS-DS at 3 months (any time) n = 337 Group 3 Patients with PHQ-9 score at 3 months & R-SMS-DS at 3 months (±6 days) n = 213
Age     
Mean (SD) 43.5 (13.37) 44.7 (13.14) 42.2 (11.13) 42.5 (11.18)
Median (min, max) 43 (18, 93) 43.5 (18, 89) 42 (18, 75) 42 (18, 75)
Gender, n (%)     
 Male 201 (26.6) 159 (26.4) 86 (25.5) 50 (23.5)
 Female 554 (73.4) 443 (73.6) 251 (74.5) 163 (76.5)
Employment, n (%)     
 Working full-time 281 (37.2) 223 (37.0) 140 (41.5) 80 (37.6)
 Working part-time 144 (19.1) 116 (19.3) 63 (18.7) 47 (22.1)
 Unable to work 95 (12.6) 69 (11.5) 36 (10.7) 20 (9.4)
 Looking after home 83 (11.0) 62 (10.3) 37 (11.0) 25 (11.7)
 Retired 65 (8.6) 61 (10.1) 15 (4.5) 10 (4.7)
 Full-time education 23 (3.0) 17 (2.8) 13 (3.9) 8 (3.8)
 Other 48 (6.4) 40 (6.6) 23 (6.8) 18 (8.5)
 Missing 16 (2.1) 14 (2.3) 10 (3.0) 5 (2.3)
Depression, mean (SD)     
 Age at 1st major episode 25.2 (12.28) 25.6 (12.51) 23.8 (11.03) 24.9 (11.66)
 Baseline BDI-II 32.5 (8.72) 32.1 (8.62) 31.8 (8.54) 31.5 (8.27)
 Baseline PHQ-9 16.0 (5.29) 15.7 (5.32) 15.6 (5.48) 15.4 (5.29)