condition mean min max ZT0-3 391.132311 391.132311 391.132311 ZT4-7 306.898642 306.898642 306.898642 ZT8-11 319.038257 319.038257 319.038257 ZT12-15 370.682191 370.682191 370.682191 ZT16-19 167.642964 167.642964 167.642964 ZT20-23 153.86626950000002 153.86626950000002 153.86626950000002