condition mean min max ZT0-3 84.140233 84.140233 84.140233 ZT4-7 66.92215949999999 66.92215949999999 66.92215949999999 ZT8-11 100.922003 100.922003 100.922003 ZT12-15 111.8916245 111.8916245 111.8916245 ZT16-19 116.495361 116.495361 116.495361 ZT20-23 99.1646295 99.1646295 99.1646295