condition mean min max ZT0-3 24.135344 24.135344 24.135344 ZT4-7 35.621945 35.621945 35.621945 ZT8-11 41.364138499999996 41.364138499999996 41.364138499999996 ZT12-15 32.7472585 32.7472585 32.7472585 ZT16-19 36.8538095 36.8538095 36.8538095 ZT20-23 34.3067735 34.3067735 34.3067735