condition mean min max ZT0-3 10.854592499999999 10.79415 10.915035 ZT4-7 7.466115 7.466115 7.466115 ZT8-11 10.90435 10.90435 10.90435 ZT12-15 0 0 0 ZT16-19 12.1863 12.1863 12.1863 ZT20-23 13.200849999999999 13.200849999999999 13.200849999999999