condition mean min max ZT0-3 69.143675 49.8078 88.47955 ZT4-7 25.2865 25.2865 25.2865 ZT8-11 32.20305 32.20305 32.20305 ZT12-15 0 0 0 ZT16-19 62.497350000000004 62.497350000000004 62.497350000000004 ZT20-23 58.92105000000001 58.92105000000001 58.92105000000001