condition mean min max ZT0-3 36.22665 28.58475 43.86855 ZT4-7 26.2593 26.2593 26.2593 ZT8-11 12.55845 12.55845 12.55845 ZT12-15 0 0 0 ZT16-19 20.59715 20.59715 20.59715 ZT20-23 29.95295 29.95295 29.95295