condition mean min max ZT0-3 15.6174 15.6174 15.6174 ZT4-7 13.014 13.014 13.014 ZT8-11 11.418800000000001 11.418800000000001 11.418800000000001 ZT12-15 10.301200000000001 10.301200000000001 10.301200000000001 ZT16-19 10.073910000000001 10.073910000000001 10.073910000000001 ZT20-23 15.4119 15.4119 15.4119