condition mean min max ZT0-3 1.468435 1.34091 1.5959599999999998 ZT4-7 2.460185 2.460185 2.460185 ZT8-11 4.03114 4.03114 4.03114 ZT12-15 0 0 0 ZT16-19 3.2964399999999996 3.2964399999999996 3.2964399999999996 ZT20-23 1.7797900000000002 1.7797900000000002 1.7797900000000002