condition mean min max ZT0-3 1.76506 1.76506 1.76506 ZT4-7 1.45695 1.45695 1.45695 ZT8-11 0.8087035 0.8087035 0.8087035 ZT12-15 0.6909259999999999 0.6909259999999999 0.6909259999999999 ZT16-19 1.383225 1.383225 1.383225 ZT20-23 1.407315 1.407315 1.407315