condition mean min max ZT0-3 130.08921099 116.37572428 143.80269769999998 ZT4-7 57.8949230625 53.366218384999996 62.42362774 ZT8-11 34.80544919250001 32.234683020000006 37.376215365 ZT12-15 9.0036998585 4.635401039 13.371998677999999 ZT16-19 6.8680214115 5.6415479505 8.0944948725 ZT20-23 7.9819113225 6.3324586255 9.6313640195