A study was conducted by professor Rane a gynaecologist in james cook university in australia,in 2004. 124 women were recruited to do a squat ability test. the female volunteers were recruited to do a full squat with their feet flat for 30 second without discomfort.
70 out of 124 women(more than half of them ) cannot squat, or squat on toes, or falling off the toilet, or cannot hold the full squat position for 30 second. only 54 women can hold the full squat position for 30 second.
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just as the article which I cited suggest,for western women above 40,their squat ability may decrease as aging. For those who above 50,very few of them can make full squat. if you only interview the women who above 40,you may find that their difficulty to squat will increase as they get older,but if you only interview the women under 40,the opposite might be correct, if my suggestion of peak age is correct. also,if you interview women in some colonies in Asia, you may find that younger women ten