condition mean min max ZT0-3 299.306652 299.306652 299.306652 ZT4-7 629.8340085 629.8340085 629.8340085 ZT8-11 751.735912 751.735912 751.735912 ZT12-15 547.3425275 547.3425275 547.3425275 ZT16-19 441.891397 441.891397 441.891397 ZT20-23 496.17229299999997 496.17229299999997 496.17229299999997