condition mean min max ZT0-3 15.589101 15.589101 15.589101 ZT4-7 33.147752499999996 33.147752499999996 33.147752499999996 ZT8-11 39.3590595 39.3590595 39.3590595 ZT12-15 25.531940499999997 25.531940499999997 25.531940499999997 ZT16-19 16.869946499999998 16.869946499999998 16.869946499999998 ZT20-23 14.622201 14.622201 14.622201