condition mean min max ZT0-3 50.694599999999994 50.694599999999994 50.694599999999994 ZT4-7 31.552500000000002 31.552500000000002 31.552500000000002 ZT8-11 33.79665 33.79665 33.79665 ZT12-15 42.206450000000004 42.206450000000004 42.206450000000004 ZT16-19 79.29755 79.29755 79.29755 ZT20-23 58.2197 58.2197 58.2197