condition mean min max ZT0-3 64.279675 63.9494 64.60995 ZT4-7 76.52825 76.52825 76.52825 ZT8-11 151.0315 151.0315 151.0315 ZT12-15 0 0 0 ZT16-19 153.94650000000001 153.94650000000001 153.94650000000001 ZT20-23 106.6855 106.6855 106.6855