condition mean min max ZT0-3 52.859275 52.726299999999995 52.99225 ZT4-7 39.910849999999996 39.910849999999996 39.910849999999996 ZT8-11 24.148600000000002 24.148600000000002 24.148600000000002 ZT12-15 0 0 0 ZT16-19 39.5454 39.5454 39.5454 ZT20-23 49.6145 49.6145 49.6145