condition mean min max ZT0-3 15.54225 13.5169 17.5676 ZT4-7 27.7741 27.7741 27.7741 ZT8-11 27.21405 27.21405 27.21405 ZT12-15 0 0 0 ZT16-19 26.2616 26.2616 26.2616 ZT20-23 32.76735 32.76735 32.76735