condition mean min max ZT0-3 24.55 24.55 24.55 ZT4-7 29.7 29.7 29.7 ZT8-11 12.9 12.9 12.9 ZT12-15 45.800000000000004 45.800000000000004 45.800000000000004 ZT16-19 36.95 36.95 36.95 ZT20-23 31.549999999999997 31.549999999999997 31.549999999999997