condition mean min max ZT0-3 1.4710239999999999 1.4710239999999999 1.4710239999999999 ZT4-7 0.9526965 0.9526965 0.9526965 ZT8-11 0.6026575000000001 0.6026575000000001 0.6026575000000001 ZT12-15 1.2039549999999999 1.2039549999999999 1.2039549999999999 ZT16-19 1.7915459999999999 1.7915459999999999 1.7915459999999999 ZT20-23 1.028759 1.028759 1.028759