condition mean min max ZT0-3 25.2396 25.2396 25.2396 ZT4-7 19.03215 19.03215 19.03215 ZT8-11 20.76365 20.76365 20.76365 ZT12-15 23.3207 23.3207 23.3207 ZT16-19 29.13795 29.13795 29.13795 ZT20-23 26.17295 26.17295 26.17295