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The sample size formula of Donner and Klar assumes that the number of subjects is the same in each cluster.
This group of subjects is the same reported in our previous genetic studies in FM looking for polymorphisms of the adrenergic receptor [ 9] and catecholamine-degrading enzyme (COMT) [ 10].
Regarding censored regression, one of the assumptions of this model is that the distribution of underlying BP in treated subjects is the same as the distribution of measured BP in untreated subjects, which might be often wrong (Tobin et al. 2005) and not necessarily true in our sample.
Similar(57)
Lung capacity of the infected subjects was the same as that of the healthy ones, and running on a treadmill for 15 minutes felt no harder.
(Despite his new lifestyle, the subjects are the same as ever. 'Deviant' has a rapper asking him: 'Yo Shaun, you got the number for the guy with some?').
Exclusion criteria for control subjects were the same as for the migraine group.
The subjects were the same as those described in our previous paper [7].
The diameter and length of dental implants of all subjects were the same in groups, 3.7 mm diameter and 11.5 mm length.
Positioning of the subjects was the same as for the patients.
The calculated 95% range for ALT in female subjects was the same as the institutional RI.
All other eligibility criteria for the control subjects were the same as those for the cases.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com