Sana, Weston, and Cepeda (2013) in two experiments found that students performed worse when using computers. Furthermore, other students not using computers, but who could see the screen, also performed worse. Being experiments, their findings are supportive of a causal connection between laptop use in the classroom and poor grades.

Your findings are contrary to that and surprising given what we know from cognitive science about the generally poor abilities of people to multitask. What do you think is different in your study that may explain the differences compared to Sana, et al (2013)?

Sana, F., Weston, T., & Cepeda, N. J. (2013). Laptop multitasking hinders classroom learning for both users and nearby peers. Computers & Education, 62, 24-31. http://dx.doi.org/10.1016/j.compedu.2012.10.003