condition mean min max ZT0-3 4.3767825 4.309585 4.44398 ZT4-7 4.84445 4.84445 4.84445 ZT8-11 5.377825 5.377825 5.377825 ZT12-15 0 0 0 ZT16-19 7.111535 7.111535 7.111535 ZT20-23 6.566665 6.566665 6.566665