condition mean min max ZT0-3 24.595425 24.47665 24.714199999999998 ZT4-7 13.225850000000001 13.225850000000001 13.225850000000001 ZT8-11 12.34245 12.34245 12.34245 ZT12-15 0 0 0 ZT16-19 25.92455 25.92455 25.92455 ZT20-23 21.9339 21.9339 21.9339