condition mean min max ZT0-3 52.719642185 43.07677979 62.36250458 ZT4-7 71.364308155 68.14677562333333 74.58184068666667 ZT8-11 77.147409265 76.47616734 77.81865119 ZT12-15 68.290860835 63.30146452 73.28025715 ZT16-19 62.39856771833334 59.82663023 64.97050520666667 ZT20-23 52.77549725 50.398686850000004 55.15230765