condition mean min max ZT0-3 16.376346 16.376346 16.376346 ZT4-7 16.1132845 16.1132845 16.1132845 ZT8-11 16.0312805 16.0312805 16.0312805 ZT12-15 17.251693000000003 17.251693000000003 17.251693000000003 ZT16-19 19.395172000000002 19.395172000000002 19.395172000000002 ZT20-23 15.9445615 15.9445615 15.9445615