condition mean min max ZT0-3 50.8 50.8 50.8 ZT4-7 93.0 93.0 93.0 ZT8-11 75.15 75.15 75.15 ZT12-15 77.75 77.75 77.75 ZT16-19 56.199999999999996 56.199999999999996 56.199999999999996 ZT20-23 48.550000000000004 48.550000000000004 48.550000000000004