condition mean min max ZT0-3 807.155134 807.155134 807.155134 ZT4-7 744.9358785 744.9358785 744.9358785 ZT8-11 831.316273 831.316273 831.316273 ZT12-15 582.489071 582.489071 582.489071 ZT16-19 645.0746995 645.0746995 645.0746995 ZT20-23 440.55487 440.55487 440.55487