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. Author manuscript; available in PMC: 2010 Nov 10.
Published in final edited form as: Sex Transm Dis. 2008 Jul;35(7):689–695. doi: 10.1097/OLQ.0b013e31816b1fcc

TABLE 2.

Unadjusted incidence rates and 95% confidence intervals for any STI, Ct, GC and Tv

Primary partner MC status Circumcised Uncircumcised Unknown

Outcome Total events Total PY* Events IR* per 100 PY* (95% CI*) Events IR per 100 PY 95% CI Events IR per 100 PY 95% CI
Ct 408 9,899 80 4.46 (3.48, 5.44) 280 3.91 (3.45, 4.37) 48 5.06 (3.63, 6.49)
GC 305 10,016 68 3.77 (2.87, 4.66) 220 3.04 (2.64, 3.45) 17 1.73 (0.91, 2.56)
Tv 362 9,903 80 4.47 (3.49, 5.45) 270 3.78 (3.33, 4.24) 12 1.23 (0.53, 1.92)
Any STI 887 9,440 175 10.28 (8.76, 11.81) 645 9.48 (8.75, 10.21) 67 7.19 (5.47, 8.91)
*

PY = person-years; IR = incidence rate; CI = confidence interval

If women were missing outcomes for any individual STI at a given visit, she received a missing value for ‘any STI.’ Consequently there are more missing outcomes for “any STI” than for individual STIs, and therefore the individual STIs do not sum to the “any STI” total of 895 cases.