condition mean min max ZT0-3 14.461039 14.461039 14.461039 ZT4-7 15.390706000000002 15.390706000000002 15.390706000000002 ZT8-11 14.727069499999999 14.727069499999999 14.727069499999999 ZT12-15 14.265664000000001 14.265664000000001 14.265664000000001 ZT16-19 19.8109265 19.8109265 19.8109265 ZT20-23 16.049371999999998 16.049371999999998 16.049371999999998