condition mean min max ZT0-3 50.65 50.65 50.65 ZT4-7 41.4 41.4 41.4 ZT8-11 18.950000000000003 18.950000000000003 18.950000000000003 ZT12-15 43.85 43.85 43.85 ZT16-19 39.85 39.85 39.85 ZT20-23 28.55 28.55 28.55