Table 1.

Pre-treatment patient characteristics by treatment condition.

Variable	All groups (N = 434)		ICBT (n = 108)		ICBT-extension (n = 103)		ICBT-booster (n = 110)		ICBT-extension + booster (n = 113)
	n	%	n	%	n	%	n	%	n	%
Age
Mean (SD)	35.90 (12.10)		34.54 (11.59)		34.85 (10.19)		37.27 (12.03)		36.83 (14.01)
Range	18–79		18–70		18–61		20–71		18–79
Gender
Female	328	75.6	83	76.9	71	68.9	89	80.9	85	75.2
Male	101	23.3	23	21.3	31	30.1	19	17.3	28	24.8
Transgender	1	0.2	–	–	1	1.0	–	–	–	–
Non-binary	–	–	–	–	–	–	–	–	–	–
Two spirit	1	0.2	–	–	–	–	1	0.9	–	–
Prefer not to disclose	3	0.7	2	1.9	–	–	1	0.9	–	–
Marital status
Single/dating/never married	118	27.2	29	26.9	33	32.0	22	20.0	34	30.1
Married/common-law	266	61.3	65	60.2	61	59.2	77	70.0	63	55.8
Separated/divorced/widowed	50	11.5	14	13.0	9	8.7	11	10.0	16	14.2
Education
High school diploma or less	78	18.0	17	15.7	20	19.4	18	16.4	23	20.4
Some post-secondary	191	44.0	51	47.2	46	44.7	47	42.7	47	41.6
University degree	165	38.0	40	37.0	37	35.9	45	40.9	43	38.1
Employment status
Employed part- or full- time	241	55.5	65	60.2	67	65.0	52	47.3	57	50.4
Unemployed	42	9.7	12	11.1	5	4.9	13	11.8	12	10.6
Homemaker	70	16.1	15	13.9	15	14.6	26	23.6	14	12.4
Student	41	9.4	13	12.0	9	8.7	8	7.3	11	9.7
Disability	53	12.2	11	10.2	11	10.7	12	10.9	19	16.8
Retired	14	3.2	3	2.8	1	1.0	2	1.8	8	7.1
Other reasons no paid work	59	13.6	14	13.0	9	8.7	19	17.3	17	15.0
Missed work in past 3 months due to mental health	120	27.6	23	21.3	33	32.0	31	28.2	33	29.2
Rating of job performance at work rated 0 to 10	5.35 (2.06)		5.38 (2.02)		5.32 (2.20)		5.62 (1.71)		5.06 (2.29)
Ethnicity
White	373	85.9	95	88.0	90	87.4	90	81.8	98	86.7
Indigenous	31	7.1	5	4.6	5	4.9	12	10.9	9	8.0
Other/prefer not to disclose	30	6.9	8	7.4	8	7.8	8	7.3	6	5.3
Location
City over 100,000	244	56.2	68	63.0	57	55.3	58	52.7	61	54.0
Small city	44	10.1	12	11.1	9	8.7	11	10.0	12	10.6
Small rural (under 10,000)	146	33.6	28	25.9	37	35.9	41	37.3	40	35.4
Pre-treatment mental health characteristics
Receiving treatment for mental health	198	45.6	43	39.8	47	45.6	49	44.5	59	52.2
Current use of psychotropic medication	260	59.9	64	59.3	65	59.1	58	56.3	73	64.2
Lifetime use of family doctor/walk-in/nurse/other health professional	384	88.5	86.1	93	90.0	99	89.3	92	88.5	100
Lifetime use of psychiatrist	153	35.3	30.6	33	43.6	48	28.2	29	38.1	43
Lifetime use of psychologist/counsellor/social worker	287	66.1	70.4	76	63.6	70	65.0	67	65.5	74
Lifetime use of any professionala	400	92.4	99	91.7	94	91.3	103	93.6	104	92.0
Lifetime treatment program useb	90	20.7	24	22.2	23	20.9	17	16.5	26	23.0
Lifetime use of emergency room/ambulance/crisis service	87	20.0	20	18.5	28	25.5	16	15.5	23	20.4
PHQ-9 ≥ 10	333	76.7	81	75.0	74	71.8	86	78.2	92	81.4
GAD-7 ≥ 10	321	74.0	78	72.2	76	73.8	80	72.7	87	77.0
PDSS-SR ≥ 8	227	52.3	56	51.9	59	57.3	50	45.5	62	54.9
SIAS ≥ 7 and SPS ≥ 2	212	48.8	50	46.3	60	58.3	47	42.7	55	48.7
PCL-5 ≥ 33	134	30.9	38	35.2	25	24.3	35	31.8	36	31.9
No scores in clinical range	24	5.5	5	4.6	9	8.7	5	4.5	5	4.4
Mean # scores > cut-off	2.83 (1.45)		2.81 (1.44)		2.85 (1.52)		2.71(1.38)		2.94 (1.47)
Credibility of ICBT (3 to 27)	20.91 (4.47)		21.15 (4.37)		20.37 (4.26)		21.28 (4.46)		20.81 (4.77)

Note. ICBT = Internet-delivered Cognitive Behaviour Therapy; PHQ-9 = Patient Health Questionnaire-9; GAD-7 = Generalized Anxiety Disorder-7; PDSS-SR = Panic Disorder Severity Scale Self- Report; SIAS = Social Interaction Anxiety Scale; SPS = Social Phobia Scale; PCL-5 = PTSD Checklist for DSM-5.

^aProfessionals include family doctor, walk-in clinics, nurse, other health professionals, psychiatrist, psychologist, counsellor, or social worker.

^bTreatment programs include psychiatric day or part-time treatment programs, alcohol/drug programs, self-help groups, and occupational stress injury programs.