condition mean min max ZT0-3 23.2704557325 13.59857734 32.942334125 ZT4-7 55.645662195 47.27490852 64.01641587 ZT8-11 41.077271135000004 32.060980505 50.093561765 ZT12-15 7.754082818999999 3.8994296954999994 11.6087359425 ZT16-19 2.2334204965 1.7112178555 2.7556231375 ZT20-23 1.7095968935 1.29456131 2.124632477