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Table-Odds ratio for various sampling devices for detecting mild dyskaryosis or worse relative to extended tip spatula alone.Odds ratios have been calculated by pooling all studies and adjusting for underlying rate in each study.All studies Screening only Referral only Odds ratio (95% No of smears confidence No of smears Odds ratio (95% No of smears Odds ratio (95% taken Interval) taken confidence) taken confidence)Extended tip 27 939 1.00 11 302 1.00 905 1.00 Ayre 14 329 0.87 (0.79 to 0.96) 1232 0.49 (0.24 to 1.01) 1039 0.92 (0.69 to 1.23) Ayre plus* 11 459 1.09 (0.97 to 1.23) 7373 0.57 (0.26 to 1.29) 911 1.63 (1.24 to 2.15) Extended tip plus* 12 023 1.08 (0.95 to 1.22) 7342 1.14 (0.77 to 1.69) 954 1.77 (1.27 to 2.46) Brush or swab 2302 0.75 (0.62 to 0.90) 1050 0.32 (0.15 to 0.70) 1252 1.04 (0.79 to 1.36) Cervex 10 054 1.05 (0.96 to 1.16) 3381 1.00 (0.62 to 1.61) 280 1.37 (0.87 to 2.14) Cytopick 3406 1.08 (0.68 to 1.73) 34061.10 (0.66 to 1.82) 0 -Bayne 4320 1.12 (0.80 to 1.57) 4320 0.59 (0.25 to 1.40) 0 *Cytobrush or cotton swab.Note that some studies had a mixture of screening referral smears or were conducted in gynaecology clinics and have only been included as "all studies."