condition mean min max ZT0-3 12.036 12.036 12.036 ZT4-7 13.232099999999999 13.232099999999999 13.232099999999999 ZT8-11 7.561885 7.561885 7.561885 ZT12-15 9.2828 9.2828 9.2828 ZT16-19 9.16483 9.16483 9.16483 ZT20-23 10.48926 10.48926 10.48926