condition mean min max ZT0-3 1227.283318 1227.283318 1227.283318 ZT4-7 455.6993905 455.6993905 455.6993905 ZT8-11 306.0080285 306.0080285 306.0080285 ZT12-15 512.7624000000001 512.7624000000001 512.7624000000001 ZT16-19 717.8250535 717.8250535 717.8250535 ZT20-23 1077.3081525 1077.3081525 1077.3081525