Table 1. Baseline characteristics and attendance information for the pooled sample and each service, subdivided into non-depressed (‘No dep’) and depressed (‘Current dep’) at entry to treatment.

Sample	n	Female %	White British %	Employed %	Age		Attendance		Dropout %b
					M	SD	Ma	SD
Pooled	1554	70.80c	88.85c	59.00c	49.37c	12.74c	6.37	2.39	16.93c
No dep	726	72.81c	90.23c	64.02c	49.68c	13.02c	6.42	2.35	16.26c
Current dep	828	69.10c	87.36c	52.27c	49.10c	12.50c	6.33	2.42	17.55c
Swallow	150	72.00	76.00	53.02c	44.92	12.09	5.25/8	2.06	20.00
No dep	78	71.79	83.33	51.95c	43.73	11.77	5.06/8	2.20	24.36
Current dep	72	72.22	68.01	54.17	46.21	12.39	5.44/8	1.90	15.27
Robin	508	70.47c	89.78c	–	49.01c	11.97c	5.77/8	2.32	20.28c
No dep	245	71.55c	89.06c	–	49.65c	12.36c	5.91/8	2.20	17.83c
Current dep	263	69.50c	90.43c	–	48.44c	11.60c	5.65/8	2.43	22.48c
Jackdaw	475	70.99c	93.24c	60.90c	50.92	12.95	6.92/9	2.31	14.11
No dep	280	74.05c	92.21c	67.39c	51.23	13.38	6.96/9	2.30	13.93
Current dep	195	66.84c	96.10c	51.56c	50.49	12.32	6.86/9	2.33	14.36
Woodpecker	181	67.40	–	–	47.45c	13.58c	–	–	–
No dep	59	74.57	–	–	48.56	13.57	–	–	–
Current dep	122	63.93	–	–	46.91c	13.61c	–	–	–
Blackbird	240	72.92	–	–	51.25	12.78	7.20/9	2.27	13.75
No dep	64	71.88	–	–	51.28	12.89	7.48/9	2.10	10.94
Current dep	176	73.30	–	–	51.24	12.77	7.10/9	2.32	14.77

Symbol ‘–’ denotes that no data was obtained

^aEach service offered a different number of MBCT sessions, so at each service the mean number of sessions attended is presented against the total number offered

^bDropout refers to the percentage of participants who attended fewer than four MBCT sessions

^cDue to missing data, the sample used to calculate the value in this cell differs from n. Refer to Supplementary Table S1 for the specific sample size