condition mean min max ZT0-3 61.334531 61.334531 61.334531 ZT4-7 79.542939 79.542939 79.542939 ZT8-11 120.0136305 120.0136305 120.0136305 ZT12-15 93.156514 93.156514 93.156514 ZT16-19 341.9591635 341.9591635 341.9591635 ZT20-23 414.714292 414.714292 414.714292