condition mean min max ZT0-3 47.8303 47.8303 47.8303 ZT4-7 29.4887 29.4887 29.4887 ZT8-11 18.943800000000003 18.943800000000003 18.943800000000003 ZT12-15 32.106500000000004 32.106500000000004 32.106500000000004 ZT16-19 45.9809 45.9809 45.9809 ZT20-23 59.11513333333333 59.11513333333333 59.11513333333333