Table A2.1

 Precision of hypothetical prevalence estimates at differing intraclass correlation coefficients

ICCAge group 16–25 yearsAge group 26–39 years
Women (if n = 4000)Men (if n = 2666)Women (if n = 2000)Men (if n = 1333)
Prevalence95% CIPrevalence95% CI
ICC, intraclass correlation coefficient. Binomial confidence intervals are shown.
0.0014.0%3.31 to 4.693.18 to 4.820.5%0.15 to 0.850.07 to 0.93
0.0024.0%3.23 to 4.773.12 to 4.880.5%0.11 to 0.890.04 to 0.96
0.0016.0%5.16 to 6.845.00 to 6.992.0%1.30 to 2.701.18 to 2.82
0.0026.0%5.07 to 6.934.94 to 7.062.0%1.23 to 2.771.12 to 2.88