Table 5.

Effect sizes (Non-Users minus Users) and Ns for use of oral contraception (heterosexuals from study 1 only).

Interval	Effect Sizes		Ns (Non-users/Users)
	Side of Head		Side of Head
	Left	Right	Left	Right
Click → I	− 0.06	+ 0.01	48/34	48/34
I → V	− 0.21	− 0.15	48/34	48/34
V → Na	+ 0.20	− 0.33	47/34	46/35
Na → Nb	− 0.32	− 0.21	46/32	45/34
Nb → N1	− 0.45	− 0.21	46/26	44/30
N1 → N2	+ 0.10	− 0.31	48/34	47/34

Resampling revealed that none of these effect sizes was large enough to occur less often than 5% of the time.

A plus sign indicates a longer interpeak interval in the non-users of OC.