condition mean min max ZT0-3 3.72765 1.17418 5.73531 ZT4-7 0.72065 0.72065 0.72065 ZT8-11 1.2483305 1.2483305 1.2483305 ZT12-15 4.6308325 3.78405 5.477615 ZT16-19 7.32154 7.32154 7.32154 ZT20-23 8.863055 8.863055 8.863055