condition mean min max ZT0-3 13.754961 13.754961 13.754961 ZT4-7 13.961399499999999 13.961399499999999 13.961399499999999 ZT8-11 15.217294500000001 15.217294500000001 15.217294500000001 ZT12-15 13.336509 13.336509 13.336509 ZT16-19 12.5859785 12.5859785 12.5859785 ZT20-23 16.198844 16.198844 16.198844