condition mean min max ZT0-3 6.64804 6.596825 6.699255 ZT4-7 5.27816 5.27816 5.27816 ZT8-11 5.006405 5.006405 5.006405 ZT12-15 0 0 0 ZT16-19 18.04505 18.04505 18.04505 ZT20-23 11.4505 11.4505 11.4505