condition mean min max ZT0-3 149.252479 149.252479 149.252479 ZT4-7 136.257026 136.257026 136.257026 ZT8-11 174.31732549999998 174.31732549999998 174.31732549999998 ZT12-15 195.648608 195.648608 195.648608 ZT16-19 236.815052 236.815052 236.815052 ZT20-23 203.674443 203.674443 203.674443