Table 3. Occurrence of claustrophobic events during different phases of the MR procedure.

	Intention-to-treat analysis			Per-protocol analysis
	Short-bore MR group	Open MR group	P Value	Short-bore MR group	Open MR group	P Value
	n/total n (% [95% CI])			n/total n (% [95% CI])
First MR imaging
Total*	33/85 (39 [28 to 50])	23/87 (26 [18 to 37])	0.08	30/82 (37 [26 to 48])	23/87 (26 [18 to 37])	0.16
Entering the examination room	11/33 (33 [18 to 51])	1/23 (4 [0 to 22])	0.01	11/30 (37 [20 to 56])	1/23 (4 [0 to 22])	0.007
During positioning on the scanner table†	17/33 (52 [34 to 69])	20/23 (87 [66 to 97])	0.009	17/30 (57 [37 to 75])	20/23 (87 [66 to 97])	0.03
During MR imaging	2/33 (6 [1 to 20])	2/23 (9 [1 to 28])	1	2/30 (7 [1 to 22])	2/23 (9 [1 to 28])	1
MR imaging after cross-referral
Total*	19/23 (83 [61 to 95])	21/30 (70 [51 to 85])	0.35	12/16 (75 [48 to 93])	18/27 (67 [46 to 84])	0.73
Entering the examination room	7/19 (37 [16 to 62])	3/21 (14 [3 to 36])	0.15	7/12 (58 [28 to 85])	3/18 (17 [4 to 41])	0.045
During positioning on the scanner table†	4/19 (21 [6 to 46])	15/21 (71 [48 to 89])	0.002	4/12 (33 [10 to 65])	15/18 (83 [59 to 96])	0.009
During MR imaging	1/19 (5 [0 to 26])	0/21 (0 [0 to 16])	0.47	1/12 (8 [0 to 39])	0/18 (0 [0 to 19])	0.4

Values are numbers (%) and 95% confidence intervals (CI). Percentages may not total 100% because of rounding. P values were obtained using the chi-squared and Fisher's exact test. See Figure 1 for the flow of patients.

*Patients who did not attend their MR appointment due to claustrophobia were classified as having an event for the intention-to-treat analysis but were not otherwise categorized.

^†Including preparation of the patients on the MR table.