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Table 1 Univariate regression analysis of systematic review production time trend by publication characteristics

From: The state of population health research performance in the Middle East and North Africa: a meta-research study

Publication characteristics Beta SE Adjusted R2 p value* Time trend
Authors
 North-South collaboration 2.6 0.4 0.83 0.0004 +
 Outside MENA 2.1 0.4 0.79 0.0008 +
 Inside MENA and/or neighboring countries 3.4 0.5 0.88 0.0001 +
Journal impact factor (JIF)
 0 ≤ JIF < 2 3.3 0.7 0.72 0.0024 +
 2 ≤ JIF < 4 3.0 0.6 0.72 0.0021 +
 4 ≤ JIF < 6 0.9 0.3 0.44 0.0304 .
 JIF ≥ 6 0.8 0.3 0.44 0.0303 .
Yearly number of citations (n)
n < 10 5.5 0.7 0.87 0.0015 +
 10 ≤ n < 50 2.2 0.4 0.78 0.0009 +
 50 ≤ n < 100 0.3 0.1 0.28 0.0826 .
n ≥ 100 0.0 0.1 − 0.1 0.8887 .
Overalla 8.1 0.7 0.94 p < 0.0001 +
  1. *p value of the F test. Association statistical significance threshold was at 0.01. a The time trend for yearly number of publications was assessed using linear regression in unstratified data. “+”: statistically significant increasing trend. “.”: trend not significant