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. Author manuscript; available in PMC: 2011 Aug 1.
Published in final edited form as: Ann Epidemiol. 2010 Aug;20(8):642–649. doi: 10.1016/j.annepidem.2010.05.006

Table 3.

Hazard Ratios Detected with Approximately 90% Power by Event Rate and Lowto-High Risk Group Ratio

3.a Analyses Based on the Total HCHS/SOL Sample (n = 16,000)
Ratio of low-risk to high-risk
Rate in low-risk group 1:1 3:1 15:1
2/1000 person-years 1.85 1.90 2.50
4/1000 person-years 1.60 1.65 2.10
6/1000 person-years 1.45 1.50 1.90
8/1000 person-years 1.40 1.45 1.75
3.b Field Center- or Subgroup-Specific Analyses (n = 4,000)
Ratio of low-risk to high-risk
Rate in low-risk group 1:1 3:1 15:1
2/1000 person-years 2.95 2.95 4.15
4/1000 person-years 2.25 2.35 3.20
6/1000 person-years 2.00 2.05 2.80
8/1000 person-years 1.85 1.90 2.55
10/1000 person-years 1.75 1.80 2.40

Assuming 3-year accrual and 2-year follow-up periods and a design effect due to clustering of 1.25.

Assuming 3-year accrual and 2-year follow-up periods and a design effect due to clustering of 1.25.