condition mean min max ZT0-3 3.61654717575 3.4701199895 3.762974362 ZT4-7 2.6148783605 2.3071656045 2.9225911165 ZT8-11 2.4049851475 2.051756917 2.758213378 ZT12-15 1.74685199475 1.4968668395 1.9968371500000002 ZT16-19 3.60963838 2.847378359 4.371898401 ZT20-23 6.553682385 5.9934177425 7.1139470275