condition mean min max ZT0-3 207.610669 207.610669 207.610669 ZT4-7 490.9850225 490.9850225 490.9850225 ZT8-11 448.209283 448.209283 448.209283 ZT12-15 373.896489 373.896489 373.896489 ZT16-19 266.7757 266.7757 266.7757 ZT20-23 192.098743 192.098743 192.098743