Table 4. Comparison of littering behavior scenarios.

	Schultz et al. 2013 (65%)		85%		35%		10%
SER quintile	Butts per m2	IRR	Butts per m2	IRR	Butts per m2	IRR	Butts per m2	IRR
0.0–0.2	0.0153		0.0200		0.0083		0.0024
0.2–0.4	0.0112	0.73	0.0146	0.73	0.0060	0.73	0.0017	0.73
0.4–0.6	0.0135	0.88	0.0177	0.88	0.0073	0.88	0.0021	0.88
0.6–0.8	0.0274	1.79	0.0359	1.79	0.0148	1.79	0.0042	1.79
0.8–1.0	0.0858	5.60	0.1122	5.60	0.0462	5.60	0.0132	5.60
Total cigarette butts	145,772,501,112		190,625,578,336		78,492,885,197		22,426,538,628

Data represent the area-weighted littered cigarette butt density (butts/m²) among quintiles of Social-Environmental Risk (SER) and incidence rate ratios (IRR) for the Schutlz et al 2013 scenario (65%) compared to littering of 85%, 35%, and 10% of all cigarettes. Incidence rate ratios and intervals are back-transformed from the log scale. The total modeled number of cigarette butts littered in a year is presented for each scenario.