condition mean min max ZT0-3 45.324627 45.324627 45.324627 ZT4-7 36.0220185 36.0220185 36.0220185 ZT8-11 33.613868 33.613868 33.613868 ZT12-15 46.122060000000005 46.122060000000005 46.122060000000005 ZT16-19 35.4849745 35.4849745 35.4849745 ZT20-23 31.8956905 31.8956905 31.8956905