condition mean min max ZT0-3 17.1741 17.1741 17.1741 ZT4-7 11.72413 11.72413 11.72413 ZT8-11 10.777215 10.777215 10.777215 ZT12-15 9.80288 9.80288 9.80288 ZT16-19 9.43881 9.43881 9.43881 ZT20-23 7.423715 7.423715 7.423715