Table 2

Multivariable analysis to identify predictors of different performance indicators (RR (95% CIs))

FIT positivityColorectal cancer detection rateAdvanced adenoma detection rateNon-advanced adenoma detection ratePositive predictive value for advanced neoplasiaNNScreen to detect one case of advanced neoplasiaNNScope to detect one case of advanced neoplasia
Sex
 Male*1.001.001.001.001.001.001.00
 Female0.66 (0.64 to 0.68)0.51 (0.44 to 0.59)0.45 (0.42 to 0.48)0.50 (0.47 to 0.54)0.71 (0.67 to 0.75)2.13 (2.12 to 2.15)1.41 (1.37 to 1.46)
Age
 5 year increase1.21 (1.19 to 1.23)1.45 (1.35 to 1.56)1.27 (1.23 to 1.31)1.22 (1.17 to 1.27)1.08 (1.05 to 1.11)0.78 (0.78 to 0.78)0.93 (0.91 to 0.94)
Round
 I*1.001.001.001.001.001.001.00
 II0.61 (0.58 to 0.63)0.48 (0.40 to 0.57)0.51 (0.47 to 0.56)0.76 (0.68 to 0.84)0.82 (0.77 to 0.89)1.88 (1.86 to 1.89)1.21 (1.16 to 1.26)
 III0.55 (0.52 to 0.57)0.25 (0.20 to 0.32)0.48 (0.44 to 0.52)0.76 (0.68 to 0.85)0.78 (0.72 to 0.85)2.17 (2.15 to 2.19)1.28 (1.22 to 1.34)
 IV0.53 (0.51 to 0.56)0.24 (0.18 to 0.32)0.48 (0.43 to 0.53)0.67 (0.59 to 0.76)0.80 (0.73 to 0.88)2.18 (2.16 to 2.20)1.25 (1.19 to 1.31)
 V0.57 (0.54 to 0.60)0.22 (0.16 to 0.29)0.49 (0.44 to 0.54)0.80 (0.71 to 0.91)0.77 (0.70 to 0.85)2.04 (2.02 to 2.06)1.28 (1.21 to 1.35)
 VI0.56 (0.53 to 0.60)0.18 (0.12 to 0.27)0.51 (0.45 to 0.57)0.75 (0.64 to 0.87)0.79 (0.70 to 0.89)2.13 (2.10 to 2.16)1.27 (1.19 to 1.36)
  • RRs with Wald 95% CI estimated using Poisson regression. Values were adjusted for all the variables included in the table.

  • *Reference.

  • FIT, faecal immunochemical test; NNScope, number needed to scope; NNScreen, number needed to screen; PPV, positive predictive value; RR, rate ratio.