condition mean min max ZT0-3 7.073297500000001 6.57003 7.576565 ZT4-7 4.33958 4.33958 4.33958 ZT8-11 3.3751949999999997 3.3751949999999997 3.3751949999999997 ZT12-15 0 0 0 ZT16-19 6.528544999999999 6.528544999999999 6.528544999999999 ZT20-23 6.813705000000001 6.813705000000001 6.813705000000001