condition mean min max ZT0-3 194.926203 194.926203 194.926203 ZT4-7 315.481013 315.481013 315.481013 ZT8-11 356.6637045 356.6637045 356.6637045 ZT12-15 337.462826 337.462826 337.462826 ZT16-19 235.1614695 235.1614695 235.1614695 ZT20-23 202.7845705 202.7845705 202.7845705