condition mean min max ZT0-3 2743.334756 2743.334756 2743.334756 ZT4-7 2984.751992 2984.751992 2984.751992 ZT8-11 3069.9291144999997 3069.9291144999997 3069.9291144999997 ZT12-15 2761.5324689999998 2761.5324689999998 2761.5324689999998 ZT16-19 3184.3336815000002 3184.3336815000002 3184.3336815000002 ZT20-23 2641.4039334999998 2641.4039334999998 2641.4039334999998