condition mean min max ZT0-3 15.650525000000002 14.3879 16.91315 ZT4-7 11.5994 11.5994 11.5994 ZT8-11 9.03462 9.03462 9.03462 ZT12-15 0 0 0 ZT16-19 7.6967550000000005 7.6967550000000005 7.6967550000000005 ZT20-23 8.321390000000001 8.321390000000001 8.321390000000001