Table 1.
A summary of characteristics of 614 participants in the RADAR-MDD study, with comparisons across the three study sites using Kruskal-Wallis tests.
| Characteristics | Total | KCL | CIBER | VUMC | p value |
|---|---|---|---|---|---|
| Number of participants, n | 614 | 350 | 146 | 118 | |
| Age (median [IQR]) |
49.00 [32.00, 58.75] |
45.00 [30.00, 56.00] |
54.00 [49.00, 61.00] |
40.00 [26.00, 57.75] |
<0.001 |
| Female, n (%) | 465 (75.7) | 267 (76.3) | 106 (72.6) | 92 (78.0) | 0.56 |
| Marital status, n (%) | 0.005 | ||||
| Single/separated/divorced/widowed | 328(53.4) | 185(52.9) | 66 (45.2) | 77 (65.3) | |
| Married/cohabiting/LTR | 286 (46.6) | 165 (47.1) | 80 (54.8) | 41 (34.8) | |
| Ethnicity, n (%) | <0.001 | ||||
| White | 404 (86.3) | 295 (84.3) | – | 109 (92.4) | |
| Black | 14 (3.0) | 11 (3.1) | – | 3 (2.5) | |
| Asian | 16 (3.4) | 16 (4.6) | – | 0 (0) | |
| Other | 34 (7.3) | 28 (8.0) | – | 6 (5.1) | |
| Employed, n (%) | 258 (42.0) | 186 (53.1) | 33 (22.6) | 39 (33.1) | <0.001 |
| Having children, n (%) | 304(49.5) | 152 (43.4) | 111 (76.0) | 41 (34.8) | <0.001 |
| Years in education (median [IQR]) |
16.00 [13.00, 19.00] |
17.00 [14.00, 19.00] |
11.00 [9.00, 15.75] |
16.50 [14.00, 20.00] |
<0.001 |
| Annual income, n (%) | <0.001 | ||||
| <15,000 (£/€) | 152 (24.8) | 74 (21.1) | 47 (32.2) | 31 (26.3) | |
| 15,000–55,000 (£/€) | 348 (56.7) | 203 (58.0) | 92 (63.0) | 53 (44.9) | |
| 55,000 (£/€) | 98 (16.0) | 72 (20.6) | 7 (4.8) | 19 (16.1) | |
| Accommodation, n (%) | <0.001 | ||||
| Own outright/with mortgage | 323 (52.6) | 169 (48.3) | 105 (71.9) | 49 (41.5) | |
| Renting | 236 (38.4) | 151 (43.1) | 27 (18.5) | 58 (49.2) | |
| Living rent-free | 46 (7.5) | 29 (8.3) | 10 (6.8) | 7 (5.9) | |
| Baseline PHQ8 score (median [IQR]) |
10.00 [7.00, 16.00] |
9.00 [6.00, 13.00] |
15.50 [10.00, 19.00] |
8.00 [6.00, 14.00] |
<0.001 |
| Having comorbidities, n (%) | 311 (50.7) | 176 (50.3) | 96 (65.8) | 39 (33.1) | |
| Taking depression medication, n (%) | 400 (65.1) | 206 (58.9) | 133 (91.1) | 61 (51.7) | |
| Number of contact logs (median [IQR]) |
4.00 [2.00, 7.00] |
5.00 [3.00, 8.00] |
3.00 [2.00, 5.00] |
2.00 [1.00, 3.75] |
<0.001 |
| Provided phone, n (%) | 151 (25.1) | 120 (34.9) | 8 (5.7) | 23 (19.5) | <0.001 |
| Brand of smartphone, n (%) | <0.001 | ||||
| Motorola | 240 (39.7) | 171 (49.7) | 30 (20.8) | 39 (33.3) | |
| Samsung | 194 (32.1) | 94 (27.3) | 44 (30.6) | 56 (47.9) | |
| Other | 171 (28.3) | 79 (23.0) | 70 (48.6) | 22 (18.8) |
Note, ethnicity data was not collected for participants recruited at the CIBER site.