condition mean min max ZT0-3 9.531385 8.22537 10.837399999999999 ZT4-7 9.78782 9.78782 9.78782 ZT8-11 9.882285 9.882285 9.882285 ZT12-15 0 0 0 ZT16-19 12.280750000000001 12.280750000000001 12.280750000000001 ZT20-23 9.64132 9.64132 9.64132