condition mean min max ZT0-3 12.850000000000001 12.850000000000001 12.850000000000001 ZT4-7 36.9 36.9 36.9 ZT8-11 39.95 39.95 39.95 ZT12-15 22.549999999999997 22.549999999999997 22.549999999999997 ZT16-19 30.85 30.85 30.85 ZT20-23 22.450000000000003 22.450000000000003 22.450000000000003