| sample size | Mean | Std. | Skewness | Kurtosis | J-B value | P-value |
XXDS | 2417 | 0.685 | 0.175 | −0.684 | 0.087 | 189.483 | 0 |
GDSX | 2035 | 0.610 | 0.205 | −0.682 | 0.179 | 160.465 | 0 |