condition mean min max ZT0-3 6.3 6.3 6.3 ZT4-7 0.6 0.6 0.6 ZT8-11 8.350000000000001 8.350000000000001 8.350000000000001 ZT12-15 5.95 5.95 5.95 ZT16-19 28.7 28.7 28.7 ZT20-23 2.1 2.1 2.1