We randomized 54 late perimenopausal women ( 2-12 mo of amenorrhea ) and postmenopausal women ( > 12 mo of amenorrhea ) -- aged 45 to 58 years and who experienced at least four hot flashes per day , on average , for at least 4 weeks -- to one of three groups : yoga , health and wellness education ( HW ) , and wait list ( WL ) .