condition mean min max ZT0-3 0.43715125 0.27102099999999996 0.6032815 ZT4-7 0.5428774999999999 0.5428774999999999 0.5428774999999999 ZT8-11 1.3578649999999999 1.3578649999999999 1.3578649999999999 ZT12-15 0 0 0 ZT16-19 0.332819 0.332819 0.332819 ZT20-23 0.434766 0.434766 0.434766