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Table 1 Domains addressed in the questionnaire, number of items per domain, and number of significant differences between numbered and non-numbered surveys

From: Effect of numbering of return envelopes on participation, explicit refusals, and bias: experiment and meta-analysis

Domain Items Number of significant differences Numbering associated with…
Time since event that caused regret 1 0  
Consequences for patient 9 1 Extended hospital stay less frequent
Type of event 7 0  
Error committed 1 0  
Intensity and manifestations of regret 19 7 Lower intensity (all 7 differences)
Numerical scales measuring various aspects of regret 5 1 Lower sense of responsibility
Number of regretted situations 1 0  
Coping strategies 31 2 More acceptance
Greater sense of having done one’s best
Life satisfaction 5 0  
Work satisfaction 4 0  
Sleep 9 1 Less frequent bad dreams
Self-esteem 1 0  
Depression 10 0  
Self-rated health 1 0  
Absence from work 1 0  
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