Our study shows that SRs are now being produced in large numbers, with about 2,500 new publications indexed annually on Medline, of which about one-fifth are Cochrane reviews. This value is an ...

Mean age in years 38.4 (36.6 to 40.2) 38.7 (37.2 to 40.2) 38.0 (36.4 to 39.5) 37.7 (36.4 to 39.1) Gender % female 52.7 (49.2 to 56.2) 56.2 (53.1 to 59.3) 57.5 (54.6 to 60.6) 57.5 (54.5 to 60.5) ...