condition mean min max ZT0-3 39.687084 39.687084 39.687084 ZT4-7 42.472179999999994 42.472179999999994 42.472179999999994 ZT8-11 36.926379499999996 36.926379499999996 36.926379499999996 ZT12-15 33.6279015 33.6279015 33.6279015 ZT16-19 37.2532775 37.2532775 37.2532775 ZT20-23 40.5267895 40.5267895 40.5267895