Table 10.

Literature Comprising Meta-Analysis for the Pure Working Memory Storage Capacity Parameter Estimation

Study	n	Mean age	Ages sampled	Pure working memory storage capacity (items)	SE (items)
Allen & Coyne (1989)	18	69	60–75	2.5	0.7
Allen & Crozier (1992)	20	70	60–78	2.6	0.6
Bäckman & Small (1998)	130	82	75–90	2.1	1.1
Castel, Benjamin, Craik, & Watkins (2002)	18	72	65–75	2.2	0.6
Floden, Stuss, & Craik (2000)	24	71	65–77	2.3	0.7
Kahana, Howard, Zaromb, & Wingfield (2002)	28	75	69–84	2.2	0.8
Maylor, Vousden, & Brown (1999)	99	65	56–73	2.2	0.4
Murphy, Craik, Li, & Schneider (2000)	15	71	65–79	2.5	0.7
Nilsson (2003)	331	72	65–80	2.3	0.7
Weighted mean parameter estimate	683	72	56–90	2.3	1.86–2.52*

Note. n = number of participants in age range of interest per study.

^*Values represent plus or minus two standard deviations of means.