condition mean min max ZT0-3 47.268284 47.268284 47.268284 ZT4-7 45.5530135 45.5530135 45.5530135 ZT8-11 47.454847 47.454847 47.454847 ZT12-15 42.833663 42.833663 42.833663 ZT16-19 41.7423025 41.7423025 41.7423025 ZT20-23 54.2935875 54.2935875 54.2935875