condition mean min max ZT0-3 5.98142295225 4.419808066 7.5430378385 ZT4-7 9.954471329250001 8.1897527335 11.719189925 ZT8-11 11.623452177 10.051602624 13.19530173 ZT12-15 7.81116203875 6.3037028555 9.318621221999999 ZT16-19 7.44916836075 6.840442470999999 8.0578942505 ZT20-23 11.175178456500001 10.058584408000002 12.291772505