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Table 6 Phase B - Example of de-duplication on basis of differing timescale and/or attribution to eyesight

From: Pre-validation methods for developing a patient reported outcome instrument

Item No. Item Response Instrument
153 During the past week I felt lonely. 0 = rarely or none of the time (less than 1 day); 1 = some or a little of the time (1-2 days); 2 = occasionally or a moderate amount of the time (3-4 days); 3 = most or all of the time (5-7 days) CES-D
154 Do you feel alone? 0 = no, 2 = sometimes, 4 = yes UENISHI (2003)
68 In the past month have you felt lonely or isolated because of your eyesight? not at all, very rarely, a little of the time, a fair amount of the time, a lot of the time, all of the time. IVI