Table 3

Kaplan-Meier survival probability data details
   Year Number of atstart Failures Withdrawn Number of risk Accumulated survival (%) 95% Confidence interval
0 to 1 280 9 3 279.9 96.4 93.8 to 98.4
1 to 2 259 3 24 257.0 95.7 92.4 to 97.6
2 to 3 229 2 40 222.0 94.8 91.4 to 97.0
3 to 4 185 1 48 176.0 94.3 90.7 to 96.6
4 to 5 135 1 53 124.5 93.5 89.9 to 96.1
5 to 6 80 0 43 75.5 98.5 89.9 to 96.1
6 to 7 37 0 29 29.5 93.5 88.8 to 95.3

van der Weegen et al.

van der Weegen et al. BMC Musculoskeletal Disorders 2012 13:247   doi:10.1186/1471-2474-13-247

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