condition mean min max ZT0-3 102.6656485075 90.222287215 115.1090098 ZT4-7 48.9360930475 46.847621325 51.024564770000005 ZT8-11 41.28071142 38.34684 44.21458284 ZT12-15 9.7322397525 4.721737256 14.742742248999999 ZT16-19 8.1220832535 5.9979194505 10.2462470565 ZT20-23 15.07794278 13.790165495 16.365720065