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A randomized trial randomizes 200 hypertensive patients 1:1 to antihypertensive drug vs. placebo. Baseline covariate check shows the drug group has mean age 58 (SD=10) and placebo group has mean age 55 (SD=9). A -test yields . The trial protocol specified checking 18 baseline covariates. Assuming no true differences, how many would be expected to show by chance?
A randomized trial randomizes 200 hypertensive patients 1:1 to antihypertensive drug vs. placebo. Baseline covariate check shows the drug group has mean age 58 (SD=10) and placebo group has mean age 55 (SD=9). A -test yields . The trial protocol specified checking 18 baseline covariates. Assuming no true differences, how many would be expected to show by chance?