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. Author manuscript; available in PMC: 2012 Jul 1.
Published in final edited form as: Arthritis Rheum. 2011 Jul;63(7):2031–2037. doi: 10.1002/art.30345

Table 3.

Key statistics describing the individual P/C ratios of P/C ratio Groups 1–51.

Group2 N3 Mean SD4 Median 95%5 99%5 99.9%5
1 272 0.12 0.08 0.1000 0.28 0.34 0.38
2 239 0.25 0.15 0.2100 0.54 0.65 0.79
3 200 0.50 0.24 0.4630 0.97 1.11 1.3
4 102 1.1 0.44 1.020 2.0 2.24 2.6
5 81 2.6 1.24 2.380 5.0 5.54 6.7
1

Defined in Methods.

2

P/C ratio Groups 1–5.

3

Number of individual P/C ratios in the Group.

4

Standard deviation calculated from log transformed P/C ratios and using bootstrapping (see Methods).

5

Upper boundary of the P/C ratio for the indicated CI. These were calculated as follows: 95% CI SD × 1.96, 99% CI SD × 2.576, 99% CI SD × 3.291.