condition mean min max ZT0-3 4819.623592 4819.623592 4819.623592 ZT4-7 3992.9581785 3992.9581785 3992.9581785 ZT8-11 4133.1326575 4133.1326575 4133.1326575 ZT12-15 4298.955188 4298.955188 4298.955188 ZT16-19 4465.7604765 4465.7604765 4465.7604765 ZT20-23 5459.6314585 5459.6314585 5459.6314585