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. 2014 Jul 1;2014:174841. doi: 10.1155/2014/174841

Table 2.

Clinical and US evidence of bursitis in PsA patients, other SpA patients, and healthy controls.

  Psoriatic arthritis 
n = 150		 Healthy controls 
n = 95		 SpA patients 
n = 172
Clinical evidence of bursitis 8/150 
(5.3%)		 0/95∗ 
P = 0.0245; RR: 10.8079
[0.6310 to 185.1197 95% CI]		 0/172∗ 
P = 0.002; RR: 19.4768 
[1.1336 to 334.6480 95% CI]
US evidence of bursitis 17/150 
(11.3%)		 0/95∗ 
P = 0.0002; RR: 22.2517 
[1.3538 to 365.7418 95% CI]		 0/172∗ 
P < 0.0001; RR: 40.0993 
[2.4319 to 661.1959 95% CI]
Clinical + US evidence of bursitis 17/150 
(11.3%)		 0/95∗ 
P = 0.0002; RR: 22.2517 
[1.3538 to 365.7418 95% CI]		 0/172∗ 
P < 0.0001; RR: 40.0993 
[2.4319 to 661.1959 95% CI]

*If a group has no events (0), 0.5 has been added to all cells before calculating the relative risk to prevent division by zero.