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Table 2 Cooperation and refusal rates by subsample

From: To send or not to send: weighing the costs and benefits of mailing an advance letter to participants before a telephone survey

Rate (%) Group p
No Letter (n = 138) Letter (n = 137)
Response 69 (50.0) 81 (59.1) 0.147
Refusal 9 (6.5) 5 (3.6) 0.412