condition mean min max ZT0-3 5.77279630825 2.543066823 9.0025257935 ZT4-7 11.7912437175 9.327829235 14.254658200000002 ZT8-11 26.819182435000002 16.886666385 36.751698485 ZT12-15 49.4440266425 45.07180629 53.816246995 ZT16-19 32.071606349999996 26.786943359999995 37.35626934 ZT20-23 13.30982299425 11.2119721135 15.407673875