condition mean min max ZT0-3 2.4687799999999998 1.8656899999999998 2.84138 ZT4-7 1.387035 1.387035 1.387035 ZT8-11 1.809045 1.809045 1.809045 ZT12-15 2.6138425 2.37136 2.856325 ZT16-19 2.7702299999999997 2.7702299999999997 2.7702299999999997 ZT20-23 4.2277000000000005 4.2277000000000005 4.2277000000000005