condition mean min max ZT0-3 3.09535 3.09535 3.09535 ZT4-7 4.61721 4.61721 4.61721 ZT8-11 4.033265 4.033265 4.033265 ZT12-15 3.949145 3.949145 3.949145 ZT16-19 4.63663 4.63663 4.63663 ZT20-23 2.5567 2.5567 2.5567