condition mean min max ZT0-3 36.2495716525 27.536966925 44.96217638 ZT4-7 15.43645329 11.339832529999999 19.53307405 ZT8-11 15.663699245 14.721070265000002 16.606328225 ZT12-15 7.23518271825 6.513021928000001 7.9573435085 ZT16-19 9.42088705 7.4785539309999995 11.363220168999998 ZT20-23 19.6670325175 18.374593025000003 20.95947201