condition mean min max ZT0-3 5.08785128375 4.4527577234999995 5.722944844 ZT4-7 4.40714211275 3.4854899325 5.328794293 ZT8-11 6.502438069 5.685786453 7.319089685 ZT12-15 8.209128912250002 6.9716572765 9.446600548000001 ZT16-19 7.6715076335 6.5911763515 8.7518389155 ZT20-23 11.93560407 10.38544793 13.48576021