condition mean min max ZT0-3 7.258290000000001 7.258290000000001 7.258290000000001 ZT4-7 9.49544 9.49544 9.49544 ZT8-11 10.438400000000001 10.438400000000001 10.438400000000001 ZT12-15 7.3284 7.3284 7.3284 ZT16-19 5.8161249999999995 5.8161249999999995 5.8161249999999995 ZT20-23 4.607265 4.607265 4.607265