condition mean min max ZT0-3 116.001288 116.001288 116.001288 ZT4-7 108.5811935 108.5811935 108.5811935 ZT8-11 85.7332015 85.7332015 85.7332015 ZT12-15 109.26814999999999 109.26814999999999 109.26814999999999 ZT16-19 90.4571875 90.4571875 90.4571875 ZT20-23 80.08984849999999 80.08984849999999 80.08984849999999