condition mean min max ZT0-3 1.97271 1.97271 1.97271 ZT4-7 1.635565 1.635565 1.635565 ZT8-11 1.153278 1.153278 1.153278 ZT12-15 0.95973 0.95973 0.95973 ZT16-19 2.203425 2.203425 2.203425 ZT20-23 2.1155749999999998 2.1155749999999998 2.1155749999999998