condition mean min max ZT0-3 64.166719 64.166719 64.166719 ZT4-7 50.956767500000005 50.956767500000005 50.956767500000005 ZT8-11 36.79375 36.79375 36.79375 ZT12-15 21.1072515 21.1072515 21.1072515 ZT16-19 24.5095295 24.5095295 24.5095295 ZT20-23 32.433966 32.433966 32.433966