condition mean min max ZT0-3 13.613422499999999 11.372645 15.854199999999999 ZT4-7 4.275365 4.275365 4.275365 ZT8-11 15.2594 15.2594 15.2594 ZT12-15 0 0 0 ZT16-19 9.54569 9.54569 9.54569 ZT20-23 8.323799999999999 8.323799999999999 8.323799999999999