condition mean min max ZT0-3 19.4418 19.4418 19.4418 ZT4-7 18.1877 18.1877 18.1877 ZT8-11 13.8064 13.8064 13.8064 ZT12-15 11.56845 11.56845 11.56845 ZT16-19 13.77725 13.77725 13.77725 ZT20-23 16.600099999999998 16.600099999999998 16.600099999999998