condition mean min max ZT0-3 3.1503175 2.9199349999999997 3.3807 ZT4-7 3.3614 3.3614 3.3614 ZT8-11 3.9635999999999996 3.9635999999999996 3.9635999999999996 ZT12-15 0 0 0 ZT16-19 4.64461 4.64461 4.64461 ZT20-23 5.0034 5.0034 5.0034