condition mean min max ZT0-3 16.1 16.1 16.1 ZT4-7 3.0 3.0 3.0 ZT8-11 15.5 15.5 15.5 ZT12-15 5.199999999999999 5.199999999999999 5.199999999999999 ZT16-19 12.15 12.15 12.15 ZT20-23 11.6 11.6 11.6