condition mean min max ZT0-3 1.4922233333333332 1.2010049999999999 1.9191699999999998 ZT4-7 1.48028 1.48028 1.48028 ZT8-11 9.771564999999999 9.771564999999999 9.771564999999999 ZT12-15 9.15405 8.017885 10.290215 ZT16-19 4.849489999999999 4.849489999999999 4.849489999999999 ZT20-23 4.4336400000000005 4.4336400000000005 4.4336400000000005