condition mean min max ZT0-3 5.694555 5.443215 5.97725 ZT4-7 4.887645 4.887645 4.887645 ZT8-11 4.393355 4.393355 4.393355 ZT12-15 7.7740475 3.565845 11.98225 ZT16-19 4.56878 4.56878 4.56878 ZT20-23 6.077035 6.077035 6.077035