condition mean min max ZT0-3 315.462826 315.462826 315.462826 ZT4-7 463.289676 463.289676 463.289676 ZT8-11 475.026003 475.026003 475.026003 ZT12-15 402.207064 402.207064 402.207064 ZT16-19 324.7304595 324.7304595 324.7304595 ZT20-23 268.4391025 268.4391025 268.4391025