condition mean min max ZT0-3 11.0 11.0 11.0 ZT4-7 10.9 10.9 10.9 ZT8-11 7.95 7.95 7.95 ZT12-15 13.0 13.0 13.0 ZT16-19 17.1 17.1 17.1 ZT20-23 34.35 34.35 34.35