condition mean min max ZT0-3 62.223783 62.223783 62.223783 ZT4-7 51.5639575 51.5639575 51.5639575 ZT8-11 52.459644499999996 52.459644499999996 52.459644499999996 ZT12-15 51.501768999999996 51.501768999999996 51.501768999999996 ZT16-19 54.1100625 54.1100625 54.1100625 ZT20-23 67.930407 67.930407 67.930407