(a) GP identification/non-elevated K-10, n = 27						(b) GP non-identification/elevated K-10, n = 82						(c) GP identification/elevated K-10, n = 79
	Unadjusted				Adjusted			Unadjusted			Adjusted			Unadjusted			Adjusted
Patient and GP/consultation factors	n	ORa	95%CI	P-value	ORa	95%CI	P-value	ORa	95%CI	P-value	ORa	95%CI	P-value	ORa	95%CI	P-value	ORa	95%CI	P-value
Beliefs
Causal explanation
Internal	291	1.1	0.4 to 3.0	0.88		NAb		0.8	0.4 to 1.6	0.6		NAb		1.1	0.6 to 2.0	0.76		NAb
Natural world	139	0.6	0.2 to 1.6	0.29	0.5	0.2 to 1.5	0.22	0.8	0.5 to 1.4	0.44	0.5	0.3 to 1.1	0.08	0.3	0.1 to 0.7	0.01	0.1	0.0 to 0.5	0.01
Interpersonal/social	102	1.4	0.5 to 3.7	0.51	0.4	0.1 to 1.4	0.14	1.0	0.5 to 2.0	0.99	0.7	0.3 to 1.8	0.4	4.1	2.3 to 7.1	<0.001	1.3	0.5 to 3.7	0.62
Medical/iatrogenic	25	2.2	0.5 to 8.8	0.26		NAb		1.1	0.3 to 3.7	0.84		NAb		0.5	0.9 to 2.2	0.31		NAb
Supernatural	47	1.7	0.4 to 6.5	0.45	0.5	0.1 to 2.5	0.41	2.5	1.1 to 5.4	0.02	2.7	0.9 to 8.3	0.07	2.4	1.1 to 5.0	0.02	1.1	0.2 to 5.2	0.94
Beliefs about timing (duration)
Less than a week	182	1.0	NAc		1.0	NAc		1.0	NAc		1.0	NAc		1.0	NAc		1.0	NAc
Between a week and a month	88	0.8	0.3 to 2.7	0.77	0.7	0.2 to 1.8	0.40	1.2	0.6 to 2.6	0.57	1.0	0.4 to 2.2	0.92	0.9	0.4 to 2.0	0.77	0.4	0.1 to 1.7	0.22
More than a month	18	1.7	0.7 to 4.2	0.27	1.2	0.5 to 3.0	0.70	0.9	0.4 to 1.8	0.73	0.5	0.2 to 1.2	0.12	3.5	2.0 to 6.1	<0.01	1.2	0.6 to 2.6	0.58
Fears about current illness	193	0.8	0.4 to 1.6	0.58	0.9	0.4 to 2.2	0.86	1.3	0.8 to 2.1	0.26	1.2	0.7 to 2.1	0.40	2.9	1.8 to 4.7	<0.01	2.4	1.1 to 5.1	0.02
Expectations from the consultation
Diagnosis	97	0.7	0.2 to 0.4	0.5		NAb		1.7	0.8 to 3.7	0.19		NAb		0.7	0.4 to 1.3	0.21		NAb
Further investigations	50	1.5	0.4 to 5.4	0.55		NAb		1.3	0.5 to 3.6	0.55		NAb		0.8	0.3 to 2.0	0.68		NAb
Treatment (or prescription renewal)	223	0.3	0.1 to 0.7	0.01		NAb		0.7	0.4 to 1.1	0.14		NAb		0.7	0.4 to 1.2	0.16		NAb
Medical certificate or letter of referral	44	2.8	1.0 to 7.8	0.05	2.9	0.8 to 10.0	0.9	1.6	1.0 to 2.4	0.04	2.1	1.0 to 4.7	0.06	2.0	1.0 to 4.1	0.05	3.2	0.8 to 12.9	0.10
Good communication/explanations	186	2.7	0.9 to 7.4	0.06		NAb		0.8	0.5 to 1.3	0.33		NAb		1.6	1.0 to 2.8	0.06		NAb
Beliefs about pathophysiology
Belief own actions make health problems worse	158	1.5	0.7 to 3.3	0.26		NAb		1.5	0.9 to 2.5	0.11		NAb		1.2	0.7 to 2.3	0.48		NAb
Belief natural environment makes health problems worse	71	0.9	0.2 to 3.8	0.93		NAb		1.2	0.6 to 2.6	0.60		NAb		0.8	0.4 to 1.6	0.52		NAb
Belief psychosocial environment makes health problems worse	25	1.2	0.1 to 13.0	0.86	2.2	0.1 to 40.1	0.57	1.6	0.4 to 6.8	0.49	1.2	0.2 to 8.7	0.87	5.8	2.1 to 15.9	0.001	0.6	0.1 to 4.5	0.63
Belief own actions make it better	166	1.6	0.6 to 3.8	0.31		NAb		1.2	0.7 to 1.9	0.46		NAb		1.2	0.8 to 1.8	0.47		NAb
Belief that health problems will get better with medical intervention	102	0.8	0.3 to 2.0	0.58	0.8	0.3 to 2.4	0.69	0.6	0.3 to 1.1	0.10	0.6	0.3 to 1.1	0.12	0.4	0.2 to 0.8	0.01	0.5	0.1 to 1.5	0.20
Self-perceived mild to severe mental illness	107	0.6	0.1 to 5.6	0.66	0.6	0.1 to 5.4	0.58	8.4	4.5to15.7	<0.001	9.4	4.5 to 19.7	<0.001	54.7	22.0 to 135.7	<0.001	62.6	22.8to172	<0.001
Self-perceived mild to severe physical illness	141	0.8	0.3 to 2.1	0.64	1.0	0.3 to 3.5	0.96	2.5	1.5 to 4.2	0.01	1.8	0.9 to 3.6	0.10	3.5	2.0 to 6.2	<0.001	1.2	0.5 to 3	0.67
Other patient factors
Consultations in the past 6 monthsNAd
≥1	130	1.0	NAc		1.0	NAc		1.0	NAc		1.0	NAc		1.0	NAc		1.0	NAc
2–7	212	3.6	1.1 to 12.3	0.04	2.5	0.6 to 10.9	0.23	2.0	0.9 to 4.0	0.07	1.8	0.7 to 4.5	0.23	3.9	1.7 to 8.7	0.002	2.6	0.8 to 8.8	0.13
>7	108	3.4	0.9 to 13.4	0.08	1.5	0.3 to 8.6	0.62	2.3	1.1 to 4.9	0.04	1.2	0.4 to 3.3	0.71	13.0	6.5 to 26.2	<0.001	3.0	1.0 to 8.4	0.04
Days off school/work in past 6 months	175	1.6	0.6 to 4.2	0.30	3.2	1.1 to 9.4	0.03	1.9	1.0 to 3.6	0.04	2.0	0.9 to 4.3	0.08	3.7	2.2 to 6.2	<0.001	2.7	1.2 to 5.7	0.01
Consultation was patient's own idea	250	1.0	0.4 to 2.1	0.96		NAd		1.1	0.6 to 1.7	0.83		NAb		0.8	0.6 to 1.2	0.29		NAb
Took advice from family/friends for their health problem	307	1.8	0.8 to 4.0	0.15		NAd		0.7	0.4 to 1.1	0.12		NAb		0.8	0.5 to 1.3	0.33		NAb
Came alone to the consultation	319	0.8	0.3 to 2.0	0.65		NAd		0.9	0.5 to 1.8	0.84		NAb		1.2	0.7 to 2.2	0.52		NAb
Came to usual practice	227	5.6	1.4 to 21.9	0.2	6.5	1.4 to 29.5	0.02	1.0	0.7 to 1.5	0.99	1.1	0.7 to 2.0	0.62	2.8	1.7 to 4.3	<0.001	3.4	1.6 to 6.9	0.002
GP/consultation factors
GP and patient are different sex	190	0.77	0.28 to 2.1	0.60	0.8	0.3 to 2.2	0.61	1.8	1.0 to 3.2	0.05	1.8	1.0 to 3.1	0.06	1.2	0.6 to 2.2	0.63	1.5	0.6 to 3.7	0.36
GP thinks patient has a mild to severe physical illness	329	2.3	0.5 to 10.4	0.27		NAb		1.3	0.7 to 2.6	0.44		NAb		1.1	0.6 to 2.0	0.74		NAb
GP trained ≥5 hours in mental health	327		NAe			NAb		1.3	0.7 to 2.5	0.46		NAb		1.1	0.5 to 2.5	0.78		NAb
GP trained ≥5 hours in adolescent health	238	1.5	0.5 to 4.6	0.47		NAb		1.0	0.6 to 1.7	0.94		NAb		0.7	0.5 to 1.2	0.18		NAb

^aReference category for all analyses: neither identified by GP nor having high level of emotional distress on the K10.

^bVariable not included in multivariate model as was not significantly associated in the univariate.

^cBaseline odds ratio.

^dConsultations with any health professional, not only this GP.

^eToo few individuals in this group.