condition mean min max ZT0-3 62.9 62.9 62.9 ZT4-7 23.1 23.1 23.1 ZT8-11 47.8 47.8 47.8 ZT12-15 48.45 48.45 48.45 ZT16-19 34.550000000000004 34.550000000000004 34.550000000000004 ZT20-23 43.2 43.2 43.2