# Temporal Instability Analysis of Injury Severities for Angle and Non-Angle Crashes at Roundabouts
## 3 Data Description
\begin{table}
\begin{tabular}{l c c c c c c c c} \hline \hline
**Variable** & \multicolumn{2}{c}{**2012-2013**} & \multicolumn{2}{c}{**2014-2015**} & \multicolumn{2}{c}{**2016-2017**} & \multicolumn{2}{c}{**2018-2019**} \\ \cline{2-9}  & **[PERSON]** & **[PERSON]** & **[PERSON]** & **[PERSON]** & **[PERSON]** & **[PERSON]** & **[PERSON]** & **[PERSON]** \\ \hline Temporal characteristics & & & & & & & & & \\ \hline Weekend indicator (1 if a crash occurred during the weekend, 0 otherwise) & 0.227 & 0.420 & 0.226 & 0.418 & 0.213 & 0.410 & 0.233 & 0.423 \\ Weekend indicator (1 if a crash occurred during the weekend, 0 otherwise) & (0.301) & (0.459) & (0.298) & (0.458) & (0.263) & (0.440) & (0.294) & (0.456) \\ \hline Environmental characteristics & & & & & & & & \\ \hline Daylight indicator & 0.630 & 0.466 & 0.717 & 0.450 & 0.722 & 0.448 & 0.679 & 0.467 \\ (1 if the light condition was daylight, 0 otherwise) & (0.499) & (0.500) & (0.525) & (0.499) & (0.536) & (0.499) & (0.580) & (0.494) \\ Dawn indicator & 0.009 & 0.097 & 0.012 & 0.108 & 0.019 & 0.136 & 0.013 & 0.111 \\ (1 if the light condition was dawn, 0 otherwise) & (0.019) & (0.137) & (0.012) & (0.109) & (0.019) & (0.135) & (0.021) & (0.143) \\ Dark-lighted indicator (1 if the light condition was dark-lighted, 0 otherwise) & 0.242 & 0.428 & 0.209 & 0.407 & 0.205 & 0.404 & 0.204 & 0.403 \\  & (0.382) & (0.486) & (0.362) & (0.481) & (0.351) & (0.477) & (0.303) & (0.460) \\ Dark-Not Lighted-indicator (1 if the light condition was dark-not-lighted, 0 otherwise) & (0.062) & (0.241) & (0.057) & (0.231) & (0.059) & (0.236) & (0.063) & (0.243) \\ Clear indicator & & & & & & & & \\ (1 if the weather was clear, 0 otherwise) & (0.722) & (0.420) & (0.796) & (0.403) & (0.789) & (0.408) & (0.725) & (0.418) \\ Cloudy indicator & & & & & & & & \\ (1 if the weather was cloudy, 0 otherwise) & (0.122) & (0.327) & (0.118) & (0.323) & (0.118) & (0.323) & (0.135) & (0.342) \\ Rain indicator & & & & & & & & \\ (1 if the weather was rainy, 0 otherwise) & (0.092) & (0.289) & (0.72) & (0.285) & (0.080) & (0.271) & (0.074) & (0.263) \\ \hline Roadway characteristics & & & & & & & & \\ \hline Paved shoulder indicator & 0.199 & 0.400 & 0.178 & 0.383 & 0.296 & 0.457 & 0.313 & 0.464 \\ (1 if the type of shoulder was paved, 0 otherwise) & (0.174) & (0.203) & (0.025) & (0.032) & (0.218) & (0.395) & (0.301) & (0.399) \\ Unspaved shoulder indicator (1 if the type of the shoulder was unpaved, 0 otherwise) & (0.117) & (0.382) & (0.123) & (0.329) & (0.098) & (0.298) & (0.113) & (0.316) \\ Dry surface indicator & & & & & & & & \\ (1 if read the surface condition was dry, 0 otherwise) & (0.967) & 0.179 & 0.949 & 0.173 & 0.952 & 0.214 & 0.975 & 0.156 \\ (1 if the weather surface condition was wet, 0 otherwise) & (0.964) & (0.187) & (0.954) & (0.209) & (0.939) & (0.240) & (0.912) & (0.283) \\ (1 if the read surface condition was wet, 0 otherwise) & (0.003) & (0.023) & (0.049) & (0.002) & (0.041) & (0.005) & (0.037) \\ (1 if the weather was outdoor condition was wet, 0 otherwise) & (0.005) & (0.039) & (0.002) & (0.045) & (0.003) & (0.052) & (0.008) & (0.043) \\ Ice/Frost surface indicator (1 if the road surface condition was ice or frost, 0 otherwise) & 0.014 & 0.118 & 0.005 & 0.069 & 0.013 & 0.111 & 0.004 & 0.064 \\  & (0.014) & (0.119) & (0.007) & (0.083) & (0.013) & (0.115) & (0.036) & (0.187) \\ Straight indicator (1 if road roadway alignment was straight, 0 otherwise) & 0.521 & 0.500 & 0.523 & 0.500 & 0.526 & 0.499 & 0.500 & 0.500 \\  & (0.450) & (0.498) & (0.448) & (0.498) & (0.477) & (0.500) & (0.490) & (0.500) \\ \hline \hline \end{tabular}
\end{table} 
Table 2: Angle collisions descriptive statistics for significant variables (non-angle collisions statistics in parentheses).