Internet-based data inclusion in a population-based European collaborative follow-up study of inflammatory bowel disease patients: Description of methods used and analysis of factors influencing response rates

Table 3 Number of UC patients per center followed-up or lost to follow-up for ePQ and ePpPFU. Centers indicated in gray had not reached the 60% response rate threshold

Center	Total number of CD patients	EPQ response (%)	EPQ response without deaths and No IBD %	Reason for non response EPQ					PpPFU response (%)	PpPFU response without No IBD %	Reason for non response PpPFU				EPQ ànd PpPFU (%)
				Not willing	Untrace-able	No IBD	Death	Not started			Not willing	Untrace- able	No IBD	Not started
Beer Sheeva	39	28 (72)	78	3	5	1	2	0	31 (79)	79	2	6	0	0	28 (72)
Copenhagen	89	62 (70)	84	7	5	0	15	0	80 (90)	90	0	9	0	0	73 (82)
Cremona	41	28 (68)	76	2	7	0	4	0	34 (83)	83	0	7	0	0	32 (78)
Heraklion	48	31 (65)	67	2	10	0	2	3	38 (79)	79	3	12	0	0	31 (65)
Ioannina	37	32 (86)	89	2	2	0	1	0	34 (92)	92	0	3	0	0	33 (89)
Oslo	268	157 (59)	69	50	21	5	34	1	235 (88)	88	17	17	0	0	192 (72)
Reggio Emilia	50	37 (74)	80	4	5	0	4	0	42 (84)	84	4	5	0	0	41 (82)
S-Limburg	139	96 (69)	72	20	15	0	7	1	125 (90)	90	0	15	0	0	98 (71)
Vigo	65	46 (70)	73	3	14	0	2	0	51 (78)	78	2	12	0	0	47 (72)
SUBTOTAL	776	517 (67)	74	93	84	6	71	5	670 (86)	86	28	86	0	0	575 (74)
Almada	8	3 (38)	50	1	3	0	1	0	4 (50)	50	0	4	0	0	3 (38)
Dublin	123	40 (33)	36	8	33	1	12	29	55 (45)	45	1	20	1	47	39 (32)
Firenze	86	35 (41)	41	0	0	0	0	51	26 (30)	30	0	3	0	57	25 (29)
Milano	29	15 (51)	60	1	4	0	4	5	0 (0)	0	0	0	0	29	0 (0)
SUBTOTAL	246	93 (38)	41	10	40	1	17	85	85 (35)	35	1	27	1	133	67 (27)
TOTAL	1 022	610 (60)	67	103	124	7	88	90	755 (74)	74	29	113	1	133	642 (63)