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Table 1 Number of participants needed in each arm for primary outcomes

From: Effects of a liquefied petroleum gas stove intervention on pollutant exposure and adult cardiopulmonary outcomes (CHAP): study protocol for a randomized controlled trial

Outcome of interest Effect size Standard deviation Sample size (power 90%) Sample size (power 80%)
Blood pressure 5 mmHg 10 85 63
Peak expiratory flow 20 L/min/m2 40 85 63
St. George’s Respiratory Questionnaire (score) 10 20 85 63