condition mean min max ZT0-3 13.1539 13.1539 13.1539 ZT4-7 15.042000000000002 15.042000000000002 15.042000000000002 ZT8-11 14.343150000000001 14.343150000000001 14.343150000000001 ZT12-15 13.214 13.214 13.214 ZT16-19 14.10325 14.10325 14.10325 ZT20-23 12.42925 12.42925 12.42925