condition mean min max ZT0-3 141.844603 141.844603 141.844603 ZT4-7 155.5552055 155.5552055 155.5552055 ZT8-11 137.263751 137.263751 137.263751 ZT12-15 117.0777435 117.0777435 117.0777435 ZT16-19 154.42116950000002 154.42116950000002 154.42116950000002 ZT20-23 150.2035985 150.2035985 150.2035985