condition mean min max ZT0-3 48.461111110000004 48.461111110000004 48.461111110000004 ZT4-7 59.405555553333336 59.405555553333336 59.405555553333336 ZT8-11 75.78 75.78 75.78 ZT12-15 86.11000001000001 86.11000001000001 86.11000001000001 ZT16-19 60.488888886666665 60.488888886666665 60.488888886666665 ZT20-23 70.01444444333333 70.01444444333333 70.01444444333333