condition mean min max ZT0-3 145.770518 145.770518 145.770518 ZT4-7 199.281453 199.281453 199.281453 ZT8-11 101.1471605 101.1471605 101.1471605 ZT12-15 158.6803265 158.6803265 158.6803265 ZT16-19 109.6028325 109.6028325 109.6028325 ZT20-23 110.8733865 110.8733865 110.8733865