condition mean min max ZT0-3 211.440347 211.440347 211.440347 ZT4-7 133.227239 133.227239 133.227239 ZT8-11 156.7523135 156.7523135 156.7523135 ZT12-15 178.410848 178.410848 178.410848 ZT16-19 262.852351 262.852351 262.852351 ZT20-23 298.715676 298.715676 298.715676