condition mean min max ZT0-3 5.4995025 5.1455649999999995 5.85344 ZT4-7 3.45484 3.45484 3.45484 ZT8-11 5.6973199999999995 5.6973199999999995 5.6973199999999995 ZT12-15 0 0 0 ZT16-19 6.545555 6.545555 6.545555 ZT20-23 5.85963 5.85963 5.85963