A paragraph for proofreading

Hi,

Would you please review the following paragraph?

"A univariate analysis was performed using Paired t-test. Also, the variation (difference) between each participant's score after and before the work shift was calculated and was tested between the two groups using student's t-test. The linear Regression was used for multivariate analysis, and the effect of age, driving record (less or more than 5 years), history of traffic accident during the past year, the amount of sleep during the past 24 hours, circadian rhythm stability (flexible/ rigid) and amplitude (languid/ vigorous), and marital status on test scores after the work shift (third shift) was controlled.

Thanks!