condition mean min max ZT0-3 111.754737 111.754737 111.754737 ZT4-7 447.89833 447.89833 447.89833 ZT8-11 524.8627585 524.8627585 524.8627585 ZT12-15 362.6852045 362.6852045 362.6852045 ZT16-19 257.48175200000003 257.48175200000003 257.48175200000003 ZT20-23 205.72594800000002 205.72594800000002 205.72594800000002