condition mean min max ZT0-3 4.04859937075 2.537606668 5.559592073499999 ZT4-7 8.609462395 7.620452162 9.598472628 ZT8-11 15.1251619925 13.236171055 17.01415293 ZT12-15 13.12982796775 12.420615985000001 13.839039950499998 ZT16-19 10.87054072475 10.733463089499999 11.00761836 ZT20-23 7.6396342465 6.8328576245 8.4464108685