Table 1.

Study characteristics of patients treated with cemented or cementless implants for femoral neck fractures

				Cemented					Cementless
Author	Country	Time span	NOS for assessing qualitya	Number	Age, years	Female, %	ASA 3-4, %	Dementia, %	Number	Age, years	Female, %	ASA 3-4, %	Dementia, %
Costain et al. 2011 [6]	Australia	2009	Selection: **** Comparability: * Outcome: ***	12,935	Younger than 70: 13% 71-80: 32% > 80: 55%	74			12,804	Younger than 70: 7% 71-80: 26% > 80: 67%	74
Yli-Kyyny et al. 2014 [38]	Finland	1999 -2009	Selection: **** Comparability: * Outcome: ***	20,682	81	73.8		20.4	4492	81	73.8		23.8
Middleton et al. 2014 [20]	UK	2002-2011	Selection: **** Comparability: * Outcome: ***	13,280					6389
Talsnes et al. 2013 [33]	Norway	2005-2010	Selection: **** Comparability: * Outcome: ***	8674	83	74.6	56	25.5	2536	83.3	73.9	56	28.5
White et al. 2014 [37]	UK	2012	Selection: **** Comparability: * Outcome: ***	19,458			68.5		7353			73.3

aA study can be awarded a maximum of one star for each numbered item within the Selection and Outcome categories (minimum score is no stars and maximum score is four stars); a maximum of two stars can be given for Comparability; ASA = American Society of Anesthesiologists physical status classification system; NOS = Newcastle-Ottawa Scale for assessing the quality of nonrandomized studies in meta-analyses.