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Table 1 Summary Table of Studies Reporting Return Rates.

From: Return Rates for Needle Exchange Programs: A Common Criticism Answered

Author Country Needles Distributed Needles Returned Return Rate
Alcabes et al. [28] Poland/Soviet Union 1,576 670 43%
Barsdley et al. [40] Canada 77,089 61,430 80%
Doherty et al. [5] United States 70,574 68,376 97%
Donoghoe [41] United Kingdom 52,535 42,864 82%
Grob [35] Switzerland 10,244,369 9,219,932 90%
Gruer et al. [31] United Kingdom 633,100 715,220 112%
Grund et al. [42] The Netherlands 57,328 46,610 81%
Guydish et al. [24] United States 4,239 2,593 61%
Hart et al. [43] United Kingdom 107,400 82,931 77%
Hay & McKeganey [44] Scotland 138,982 116,954 84%
Heimer et al. [36] United States 80,300 56,210 70%
Honti & Ban [45] Hungary 8,142 6,466 79%
Jacob & Stover [46] Germany 21,150 20,907 99%
Kaplan et al. [29] United States 30,429 30,429 100%
Keene & Stimson [47] United Kingdom 78,813 63,228 80%
Ljunberg et al. [48] Sweden 5,348 3,665 69%
Nigro et al. [30] Sicily 376 56 15%
O'Keefe et al. [49] United States 10,108 9,499 94%
Oliver* [33] United States 100,000 102,000 102%
Paone et al. [50] United States 20,083 13,646 68%
Quan et al. [51] Vietnam 21,495 17,433 81%
Robles et al. [25] Puerto Rico 146,323 58,529 40%
Sergeyev et al. [34] Russia 31,020 31,764 102%
Stimson et al. [52] United Kingdom 24,290 19,106 78%
Vlahov et al. [27] United States 209 144 69%
Wolk et al. [32] Australia 6,306 2,608 41%
Overall Results   11,971,584 10,793,270 90%
  1. *Based upon an estimation provided by the author, rather than raw numbers.