condition mean min max ZT0-3 9.16377 8.875505 9.452035 ZT4-7 8.690835 8.690835 8.690835 ZT8-11 15.97955 15.97955 15.97955 ZT12-15 0 0 0 ZT16-19 15.381499999999999 15.381499999999999 15.381499999999999 ZT20-23 12.3911 12.3911 12.3911