Table 1.

Variables affecting the number of citations by all papers, nontheoretical papers, and theoretical papers

	All citations			Nontheoretical citations			Theoretical citations
Parameter	OR (95% CI)	Wald z	P	OR (95% CI)	Wald z	P	OR (95% CI)	Wald z	P
Intercept	28.67 (20.69–39.74)	20.189	<0.001	20.93 (14.77–29.66)	17.135	<0.001	6.14 (4.17–9.03)	9.219	<0.001
Density of equations per page	0.78 (0.66–0.93)	−2.782	0.005	0.73 (0.61–0.88)	−3.244	0.001	0.97 (0.79–1.18)	−0.338	0.735
Total no. of pages	1.05 (1.02–1.07)	3.929	<0.001	1.05 (1.02–1.08)	3.692	<0.001	1.05 (1.02–1.08)	3.379	0.001
Published in Evolution (cf. Am. Nat.)	0.95 (0.76–1.18)	−0.494	0.622	1.07 (0.85–1.35)	0.573	0.567	0.70 (0.54–0.91)	−2.692	0.007
Published in Proceedings B (cf. Am. Nat.)	1.14 (0.90–1.43)	1.102	0.270	1.22 (0.95–1.55)	1.565	0.118	0.93 (0.71–1.21)	−0.561	0.575
Equation density × no. of pages	1.02 (1.00–1.04)	1.636	0.102	1.01 (0.99–1.03)	0.937	0.349	1.03 (1.01–1.05)	2.443	0.015

The table shows statistical results from a generalized linear model with a negative binomial error structure. For a unit increase in the explanatory variable, the number of citations changes by a factor given by the OR, shown here with a 95% CI. For example, an OR of 0.78 implies a decrease of 22%, whereas an OR of 1.05 implies an increase of 5%. Significant effects (P < 0.05) based on the Wald z statistic are highlighted in bold.