condition mean min max ZT0-3 167.130414 167.130414 167.130414 ZT4-7 127.4133845 127.4133845 127.4133845 ZT8-11 146.736234 146.736234 146.736234 ZT12-15 173.3415685 173.3415685 173.3415685 ZT16-19 237.6979715 237.6979715 237.6979715 ZT20-23 241.39611100000002 241.39611100000002 241.39611100000002