condition mean min max ZT0-3 4.8018893925 4.426658031 5.177120754 ZT4-7 6.09817003375 5.5757292235 6.620610844 ZT8-11 4.974021787250001 4.6570669680000005 5.2909766065 ZT12-15 10.19050580225 8.2038696045 12.177142 ZT16-19 16.357906165 15.26289151 17.45292082 ZT20-23 18.82314711 17.91081862 19.7354756