condition mean min max ZT0-3 21.39535 21.39535 21.39535 ZT4-7 39.576750000000004 39.576750000000004 39.576750000000004 ZT8-11 28.01455 28.01455 28.01455 ZT12-15 22.58725 22.58725 22.58725 ZT16-19 11.907350000000001 11.907350000000001 11.907350000000001 ZT20-23 9.008375000000001 9.008375000000001 9.008375000000001