condition mean min max ZT0-3 79.84175 70.671 88.6502 ZT4-7 70.16515 70.16515 70.16515 ZT8-11 67.15685 67.15685 67.15685 ZT12-15 57.8281 53.23895 62.417249999999996 ZT16-19 61.522099999999995 61.522099999999995 61.522099999999995 ZT20-23 62.828900000000004 62.828900000000004 62.828900000000004