condition mean min max ZT0-3 29.593095 29.593095 29.593095 ZT4-7 41.367533 41.367533 41.367533 ZT8-11 43.7509035 43.7509035 43.7509035 ZT12-15 40.928419 40.928419 40.928419 ZT16-19 36.1246285 36.1246285 36.1246285 ZT20-23 35.35461 35.35461 35.35461