condition mean min max ZT0-3 1183.5310734 137.4206187 2229.6415281 ZT4-7 6588.6034295 5870.8717505 7306.3351084999995 ZT8-11 6387.1825902499995 4986.6118145 7787.753365999999 ZT12-15 1070.6166173475 142.305044545 1998.92819015 ZT16-19 52.81898485000001 38.28064559 67.35732411000001 ZT20-23 41.86570857225 16.4131663095 67.318250835