condition mean min max ZT0-3 139.1686008 121.7896176 156.547584 ZT4-7 96.1664015225 87.70656053 104.626242515 ZT8-11 47.5660230025 42.202018685 52.93002732 ZT12-15 23.402892387500003 20.066831225 26.73895355 ZT16-19 43.0526891725 34.043835345000005 52.061543 ZT20-23 67.697060215 65.124082855 70.270037575