Table 2.

Extreme Group Studies Included in Meta-analysis

Study	Incentive	Delay	Measure	Younger				Older				z	Var z
				N	Age			N	Age
					Mean	Range	SD		Mean	Range	SD
Bauer 2010	hypothetical	years	proportion	291	24.02	20-29	--	241	39.91	30-74	--	0.06	0.00
Buono 2015	hypothetical	years	parameter	20	22.50	18-27	--	18	50.00	45-55	--	0.35	0.03
Eppinger 2012	real	weeks	proportion	15	20.90	18-28	3	15	69.70	65-80	4.4	−0.85	0.04
Eppinger 2018	real	weeks	proportion	25	24.80	--	2.5	25	71.20	--	5.6	−0.31	0.02
Garza 2016	hypothetical	years	parameter	139	57.00	50-64	--	9	70.50	65-76	--	−0.03	0.01
Green 1994	hypothetical	years	parameter	12	20.30	--	--	12	67.90	--	--	−0.91	0.05
Halfmann 2016	hypothetical	days	parameter	77	21.00	--	--	36	77.00	--	--	−0.10	0.01
Jimura 2011	hypothetical	years	parameter	20	20.00	--	--	20	71.00	60-84	7.5	0.34	0.03
Li 2013	hypothetical	months	parameter	173	24.76	18-29	2.91	163	66.39	60-82	4.93	−0.08	0.00
Liu 2016	hypothetical	days	parameter	745	43.27	31-60	6.74	192	68.63	>61	5.46	0.07	0.00
Roalf 2012	real	days	parameter	29	30.14	21-45	5.53	25	71.30	65-85	4.36	0.14	0.02
Samanez-Larkin 2011	real	weeks	proportion	12	22.00	19-26	--	13	73.40	63-85	--	0.04	0.05
Sparrow 2018 Study 1	real	days	proportion	32	25.28	18-35	5.22	30	70.57	65-85	4.88	−0.51	0.02
Sparrow 2018 Study 2	real	days	proportion	31	20.84	18-30	2.67	23	71.35	65-97	6.96	−0.04	0.02
Sparrow 2019	real	days	proportion	36	21.00	18-30	3.44	36	70.11	65-85	4.91	0,03
Whelan 2009	hypothetical	years	parameter	16	46.00	--	3.4	10	73.00	--	4.12	0.10	0.04