condition mean min max ZT0-3 207.22931041500001 71.33725633 343.1213645 ZT4-7 20.3274300275 19.28383681 21.371023245 ZT8-11 17.110988425000002 16.19715086 18.02482599 ZT12-15 9.9011737475 8.9289106375 10.8734368575 ZT16-19 13.3733033175 11.87559747 14.871009165 ZT20-23 13.4440683675 13.072288135 13.815848599999999