Table 6

Odds ratios for indicators of lower quality among studies with negative conclusions compared to studies not concluding a negative impact

	% finding a negative outcome	% not finding a negative outcome	Odds ratios   (95% CI)	p Value
Including only subjective outcome measures	80% (28/35)^23,^31,^80–^97,^99,^103–^108,¹¹⁴	52% (32/62)^19,^20,^24,^26,^28,^32,^62–^79,^100–^102,^109–^112,¹¹⁵	4.0 (1.4 to 9.9)	0.007
Funded by the tobacco industry or a group supported by the tobacco industry	94% (29/31)^23,^31,^57–^61,^80–^97,^103,^107,^108,¹¹⁴	4%(2/62)^19,²⁰	Infinite	0.001
Not being peer reviewed?	97% (34/35)^18,^57–^61,^80–^83,^85–^97,^99,^103–^108,¹¹⁴	63% (39/62)^19,^20,^24–^26,^28–^30,^32–^34,^36–^41,^43,^50–^53,^55,^62,^67–^70,^73,^74,^78,^79,^100,^102,^109–¹¹³	20 (2.6 to 166.7)	0.004