Sample Size and Power
Given that this was a pilot study, the target sample size was not based on power but rather on available funds to provide meals for 6 months to enrolled participants. Assuming that the proportions of participants who would be admitted to nursing homes in 6 months were 11% in the daily-delivered arm and 13% in the drop-shipped frozen meals arm, among 243 participants (115 in the drop-shipped frozen arm and 128 in the daily-delivered arm), we had 80% power to detect a hazard ratio of 0.33.