Table.

Estimated relative risk and number of unpublished smaller and larger studies for various values of publication probability

Publication probability	Relative risk (95% CI)	P value	No of unpublished studies*
			Small	Large
0.6	1.11 (0.97 to 1.27)	0.110	36	24
0.7	1.13 (1.00 to 1.27)	0.052	23	15
0.8	1.15 (1.03 to 1.28)	0.014	14	9
0.9	1.18 (1.07 to 1.31)	0.002	7	4
1.0	1.24 (1.13 to 1.36)	<0.001	0	0

^*Smaller studies s>0.4; larger studies s⩽0.4.