condition mean min max ZT0-3 371.79494315 303.3316073 440.258279 ZT4-7 144.229063675 137.53934905 150.91877829999999 ZT8-11 98.8451861975 98.51687859 99.17349380499999 ZT12-15 43.6683523575 28.005276535 59.33142818 ZT16-19 27.690653242499998 21.201567429999997 34.179739055 ZT20-23 51.639149880000005 49.591177435 53.687122325000004