condition mean min max ZT0-3 67.61952500000001 66.2459 68.99315 ZT4-7 29.36435 29.36435 29.36435 ZT8-11 20.491799999999998 20.491799999999998 20.491799999999998 ZT12-15 0 0 0 ZT16-19 40.9122 40.9122 40.9122 ZT20-23 65.34665000000001 65.34665000000001 65.34665000000001