condition mean min max ZT0-3 30.145914 30.145914 30.145914 ZT4-7 23.7726565 23.7726565 23.7726565 ZT8-11 29.408564 29.408564 29.408564 ZT12-15 38.3402705 38.3402705 38.3402705 ZT16-19 25.276702 25.276702 25.276702 ZT20-23 23.200297499999998 23.200297499999998 23.200297499999998