condition mean min max ZT0-3 9.307929999999999 8.92189 9.69397 ZT4-7 6.1310649999999995 6.1310649999999995 6.1310649999999995 ZT8-11 6.00526 6.00526 6.00526 ZT12-15 0 0 0 ZT16-19 8.18678 8.18678 8.18678 ZT20-23 7.49418 7.49418 7.49418