We have found a discrepancy and possible error in the data regarding intercessory prayer presented by Harris et al.1 Table 3 in the article lists the number of events for each component of the Mid America Heart Institute–Cardiac Care Unit (MAHI-CCU) score. Summing these numbers, being careful not to include the interventional coronary procedures twice (as both the total number and the number for the different procedures are listed in Table 3), gives the total number of events as 1436 for the usual care group and 1173 for the prayer group. Dividing by the number of patients in each group (524 control group patients and 466 prayer group patients) results in an unweighted MAHI-CCU score of 2.74 for the usual care group and 2.52 for the prayer group, instead of the scores of 3.00 and 2.70 reported in Table 4 in the article.
Karis R, Karis D. Intercessory Prayer. Arch Intern Med. 2000;160(12):1870. doi: