condition mean min max ZT0-3 22.200000000000003 22.200000000000003 22.200000000000003 ZT4-7 14.8 14.8 14.8 ZT8-11 27.700000000000003 27.700000000000003 27.700000000000003 ZT12-15 21.0 21.0 21.0 ZT16-19 26.450000000000003 26.450000000000003 26.450000000000003 ZT20-23 14.95 14.95 14.95