condition mean min max ZT0-3 3.78853 2.499835 5.077225 ZT4-7 5.585190000000001 5.585190000000001 5.585190000000001 ZT8-11 2.021965 2.021965 2.021965 ZT12-15 0 0 0 ZT16-19 2.494955 2.494955 2.494955 ZT20-23 3.5224425 3.5224425 3.5224425