condition mean min max ZT0-3 6.650083333333334 5.5417000000000005 7.98965 ZT4-7 5.67804 5.67804 5.67804 ZT8-11 5.411375 5.411375 5.411375 ZT12-15 6.74414 6.63598 6.8523 ZT16-19 4.85807 4.85807 4.85807 ZT20-23 7.720515000000001 7.720515000000001 7.720515000000001