condition mean min max ZT0-3 23.3199 23.3199 23.3199 ZT4-7 23.08895 23.08895 23.08895 ZT8-11 9.949075 9.949075 9.949075 ZT12-15 10.9006 10.9006 10.9006 ZT16-19 21.03855 21.03855 21.03855 ZT20-23 19.444850000000002 19.444850000000002 19.444850000000002