condition mean min max ZT0-3 34.680881 34.680881 34.680881 ZT4-7 33.326353999999995 33.326353999999995 33.326353999999995 ZT8-11 32.372307 32.372307 32.372307 ZT12-15 34.996684 34.996684 34.996684 ZT16-19 34.365058 34.365058 34.365058 ZT20-23 31.49523 31.49523 31.49523