Cluster randomized controlled trial analysis at the cluster level: The clan command

. Author manuscript; available in PMC: 2023 Oct 17.

Published in final edited form as: Stata J. 2023 Sep 22;23(3):754–773. doi: 10.1177/1536867X231196294

	`Estimate`	`Std. Err`	`.t`	`df`	`P>\|t\|`	`[95% Conf.`	`Interval]`
`Rate`
`0`	`26.02616`
`1`	`23.60782`
`Ratio`	`.9070805`	`.1040176`	`-0.938`	`94`	`0.3509`	`.73782133`	`1.1151683`

Note: Rates are per 1000

In the control clusters, there was an average of 26.0 deaths for each 1,000 person-years of follow-up, while in the bednet clusters, this rate was around 23.6 per 1,000 person-years. This corresponds to a rate ratio of 0.91 (95% CI: [0.74 to 1.11], p-value=0.35).

A warning message indicates that because one cluster has no events, a 0.5 event was added to each cluster before calculating the log-rate.