Feasibility, acceptability and validity of SMS text messaging for measuring change in depression during a randomised controlled trial

Table 5 Linear mixed model ¹ : adjusted means and effect of trial arm at each time point

Time	Acupuncture		Counselling		Usual care		Effect of trial arm
Week	Mean	SE	Mean	SE	Mean	SE	F	df	p
2	5.56	0.136	5.73	0.143	5.74	0.195	0.48	2	.621
3	5.76	0.134	5.56	0.142	5.60	0.191	0.54	2	.582
4	5.49	0.133	5.54	0.142	5.44	0.191	0.10	2	.909
5	5.26	0.132	5.30	0.142	5.57	0.188	0.98	2	.375
6	5.10	0.135	5.18	0.144	5.25	0.193	0.22	2	.806
7	4.95	0.137	5.03	0.146	5.31	0.193	1.23	2	.292
8	4.80	0.141	4.95	0.147	5.35	0.198	2.60	2	.074
9	4.78	0.144	4.74	0.152	5.15	0.199	1.56	2	.211
10	4.62	0.147	4.57	0.154	5.39	0.207	5.91	2	.003
11	4.67	0.153	4.69	0.161	5.67	0.213	8.55	2	.000
12	4.60	0.157	4.47	0.165	5.64	0.219	10.08	2	.000
13	4.36	0.162	4.62	0.172	5.20	0.225	4.60	2	.010
14	4.21	0.169	4.64	0.176	5.10	0.238	4.82	2	.008
15	4.18	0.177	4.53	0.185	5.11	0.243	4.78	2	.008
16	4.18	0.184	4.39	0.193	5.24	0.253	5.93	2	.003

¹Model definition: SMS score over 15 weeks predicted by trial arm, time, arm x time interaction, adjusting for baseline PHQ-9.

ISSN: 1471-244X