condition mean min max ZT0-3 0.1763295 0.176211 0.176448 ZT4-7 0.3537555 0.3537555 0.3537555 ZT8-11 2.3097499999999997 2.3097499999999997 2.3097499999999997 ZT12-15 0 0 0 ZT16-19 1.73774 1.73774 1.73774 ZT20-23 0.522803 0.522803 0.522803