condition mean min max ZT0-3 6.361715 6.14467 6.57876 ZT4-7 14.15435 14.15435 14.15435 ZT8-11 14.1908 14.1908 14.1908 ZT12-15 0 0 0 ZT16-19 13.13805 13.13805 13.13805 ZT20-23 10.82996 10.82996 10.82996