For this experiment, we manipulated the color of the waiting
screen on the childline's website (red vs. white vs. blue; see
methodological detail (MD) Appendix A). This screen appears
only if there is a time lag between a child's request for a chat
and his/her being connected with the counselor. As the helpline's
system records this waiting time in minutes, we only
analyze the chats with a waiting time of more than one minute.
That is because a recorded waiting time of more than one
minute indicates that participants were indeed exposed to the
focal color manipulation for at least one minute