condition mean min max ZT0-3 65.298728 65.298728 65.298728 ZT4-7 91.3903545 91.3903545 91.3903545 ZT8-11 134.318542 134.318542 134.318542 ZT12-15 149.769438 149.769438 149.769438 ZT16-19 120.6207575 120.6207575 120.6207575 ZT20-23 92.18608549999999 92.18608549999999 92.18608549999999