Table 1.

Baseline characteristics of participant according to trial arm, in total and stratified by prognostic group, N = 1868

All participants, N = 1868Prognostic group
Minimal/mild, n = 1357Moderate,n = 288Severe, n = 223
Intervention, n = 933, mean (SD)Control, n = 935, mean (SD)Intervention, n = 679, mean (SD)Control, n = 678, mean (SD)Intervention, n = 143, mean (SD)Control, n = 145, mean (SD)Intervention, n = 111, mean (SD)Control, n = 112, mean (SD)
Age, years35.5 (12.1)35.6 (12.1)35.2 (11.7)35.5 (11.8)36.0 (13.1)35.5 (12.5)36.3 (13.4)36.5 (13.1)
Depressive symptom severity (PHQ-9)9.2 (5.8)9.3 (5.7)6.4 (3.4)6.6 (3.4)14.2 (2.3)13.9 (2.4)19.7 (3.5)19.6 (3.6)
Anxiety symptom severity (GAD-7)a8.6 (5.3)8.7 (5.1)6.7 (4.2)7.0 (4.2)11.6 (4.1)11.4 (4.5)15.9 (3.7)14.8 (4.7)
Mental health self-efficacy (MHSES)a38.1 (12.2)37.4 (12.1)42.2 (10.5)41.4 (10.5)30.2 (9.3)30.5 (9.0)24.4 (9.8)23.1 (8.8)
Quality of life (AQoL-8D)a0.6 (0.2)0.6 (0.2)0.6 (0.2)0.6 (0.2)0.4 (0.1)0.4 (0.1)0.3 (0.1)0.3 (0.1)
n (%)n (%)n (%)n (%)n (%)n (%)n (%)n (%)
Sex
  Male313 (33.5)277 (29.6)225 (33.1)191 (28.2)52 (36.4)45 (31.0)36 (32.4)41 (36.6)
  Female617 (66.1)653 (69.8)453 (66.7)485 (71.5)90 (62.9)98 (67.6)74 (66.7)70 (62.5)
  Other3 (0.3)5 (0.5)1 (0.1)2 (0.3)1 (0.7)2 (1.4)1 (0.9)1 (0.9)
Highest level of education completed
Year 11 or less109 (11.7)112 (12.0)65 (9.6)68 (10.0)21 (14.7)20 (13.8)23 (20.7)24 (21.4)
Year 12 or equivalent136 (14.6)146 (15.6)93 (13.7)94 (13.9)22 (15.4)31 (21.4)21 (18.9)21 (18.8)
Certificate/diploma211 (22.6)230 (24.6)140 (20.6)169 (24.9)35 (24.5)30 (20.7)36 (32.4)31 (27.7)
Bachelor’s degree or higher477 (51.1)447 (47.8)381 (56.1)347 (51.2)65 (45.5)64 (44.1)31 (27.9)36 (32.1)
Employment status
Employed/working for profit or pay686 (73.5)667 (71.3)513 (75.6)509 (75.1)99 (69.2)89 (61.4)74 (66.7)69 (61.6)
Unemployed92 (9.9)119 (12.7)64 (9.4)66 (9.7)17 (11.9)30 (20.7)11 (9.9)23 (20.5)
Neither working nor looking for work155 (16.6)149 (15.9)102 (15.0)103 (15.2)27 (18.9)26 (17.9)26 (23.4)20 (17.9)
Receiving benefit or disability supporta100 (11.6)133 (15.4)49 (7.9)79 (12.7)24 (17.1)30 (21.9)27 (26.2)24 (22.6)
History of depression582 (62.4)593 (63.4)341 (50.2)348 (51.3)130 (90.9)137 (94.5)111 (100.0)108 (96.4)
Long term illness245 (26.3)270 (28.9)124 (18.3)129 (19.0)56 (39.2)70 (48.3)65 (58.6)71 (63.4)
Self-rated health
  Excellent/very good/good732 (78.5)729 (78.0)596 (87.8)589 (86.9)94 (65.7)94 (64.8)42 (37.8)46 (41.1)
  Fair/poor201 (21.5)206 (22.0)83 (12.2)89 (13.1)49 (34.3)51 (35.2)69 (62.2)66 (58.9)
Live alone130 (13.9)109 (11.7)80 (11.8)62 (9.1)30 (21.0)26 (17.9)20 (18.0)21 (18.8)
Manage on available income
  Easily/not too bad/difficult some of the time832 (89.2)817 (87.4)643 (94.7)640 (94.4)121 (84.6)111 (76.6)68 (61.3)66 (58.9)
  Difficult all the time/impossible101 (10.8)118 (12.6)36 (5.3)38 (5.6)22 (15.4)34 (23.4)43 (38.7)46 (41.1)
Number of times visited a psychologist/counsellor (past 12 months)
  0549 (58.8)529 (56.6)436 (64.2)428 (63.1)64 (44.8)55 (37.9)49 (44.1)46 (41.1)
  1–6292 (31.3)312 (33.4)187 (27.5)198 (29.2)57 (39.9)65 (44.8)48 (43.2)49 (43.8)
  ≥792 (9.9)94 (10.1)56 (8.2)52 (7.7)22 (15.4)25 (17.2)14 (12.6)17 (15.2)
Current use of antidepressants190 (20.4)226 (24.2)92 (13.5)120 (17.7)54 (37.8)58 (40.0)44 (39.6)48 (42.9)
Frequency of internet use
  Daily904 (96.9)910 (97.3)662 (97.5)661 (97.5)139 (97.2)142 (97.9)103 (92.8)107 (95.5)
  Less than daily29 (3.1)25 (2.7)17 (2.5)17 (2.5)4 (2.8)3 (2.1)8 (7.2)5 (4.5)
  • a Denominators may vary due to missing data. Anxiety symptom severity missing n = 287 (n = 134 intervention arm; n = 153 in control arm); mental health self-efficacy missing n = 280 (n = 137 in intervention arm; n = 143 in control arm); quality of life missing n = 184 (n = 92 in intervention arm; n = 92 in control arm); receiving benefit or disability support missing n = 138 (n = 68 in intervention arm; n = 70 in control arm). AQoL-8D = Assessment of Quality of Life Instrument. GAD-7 = 7-item Generalised Anxiety Disorder scale. MHSES = Mental Health Self-Efficacy Scale. PHQ-9 = 9-item Patient Health Questionnaire. SD = standard deviation.