condition mean min max ZT0-3 65.9308736175 61.17282273 70.68892450499999 ZT4-7 56.7131187425 55.60680577 57.819431715 ZT8-11 50.74750283 50.23499965 51.26000601 ZT12-15 27.655557575000003 23.826362330000002 31.484752820000004 ZT16-19 33.09466034 28.524120174999997 37.665200505 ZT20-23 47.40065941500001 43.41981537 51.381503460000005