condition mean min max ZT0-3 15.594999999999999 15.594999999999999 15.594999999999999 ZT4-7 11.8079 11.8079 11.8079 ZT8-11 13.410350000000001 13.410350000000001 13.410350000000001 ZT12-15 20.49745 20.49745 20.49745 ZT16-19 20.325850000000003 20.325850000000003 20.325850000000003 ZT20-23 18.03745 18.03745 18.03745