condition mean min max ZT0-3 11.9 11.9 11.9 ZT4-7 115.0 115.0 115.0 ZT8-11 128.15 128.15 128.15 ZT12-15 123.5 123.5 123.5 ZT16-19 41.849999999999994 41.849999999999994 41.849999999999994 ZT20-23 14.75 14.75 14.75