condition mean min max ZT0-3 20.2857 16.76125 23.81015 ZT4-7 14.32095 14.32095 14.32095 ZT8-11 16.79135 16.79135 16.79135 ZT12-15 0 0 0 ZT16-19 24.22405 24.22405 24.22405 ZT20-23 22.76465 22.76465 22.76465