condition mean min max ZT0-3 14.972349999999999 14.972349999999999 14.972349999999999 ZT4-7 5.72235 5.72235 5.72235 ZT8-11 11.89635 11.89635 11.89635 ZT12-15 25.2487 25.2487 25.2487 ZT16-19 32.57915 32.57915 32.57915 ZT20-23 20.58535 20.58535 20.58535