condition mean min max ZT0-3 10.428193 10.428193 10.428193 ZT4-7 10.6707585 10.6707585 10.6707585 ZT8-11 11.207774 11.207774 11.207774 ZT12-15 10.0548015 10.0548015 10.0548015 ZT16-19 10.5499975 10.5499975 10.5499975 ZT20-23 11.319747 11.319747 11.319747