condition mean min max ZT0-3 14.01145 14.01145 14.01145 ZT4-7 6.651949999999999 6.651949999999999 6.651949999999999 ZT8-11 7.6890350000000005 7.6890350000000005 7.6890350000000005 ZT12-15 10.17709 10.17709 10.17709 ZT16-19 13.211500000000001 13.211500000000001 13.211500000000001 ZT20-23 13.684149999999999 13.684149999999999 13.684149999999999