condition mean min max ZT0-3 0.30407074999999995 0.2959325 0.31220899999999996 ZT4-7 0.5820705 0.5820705 0.5820705 ZT8-11 0.242917 0.242917 0.242917 ZT12-15 0 0 0 ZT16-19 0.4144795 0.4144795 0.4144795 ZT20-23 0.8680059999999999 0.8680059999999999 0.8680059999999999