# women have higher oestrogen levels during perimenopause > "I was able to find eight studies and perform a meta-analysis in four of estrogen levels in the follicular phase in 292 premenopausal versus 415 perimenopausal women and from the premenstrual portion of the cycle in 250 premenopausal versus 69 perimenopausal women. The data analysed within-centre by chi square testing showed significantly higher estrogen levels in perimenopausal women during both the follicular and premenstrual phases, respectively."[[(Prior, 2006)#^it53l]] ![[higher oestrogen levels in perimenopause.ex.svg]]