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Table 1 Frequency of articles using a particular statistical method

From: Systematic review of analytical methods applied to longitudinal studies of malaria

MethodAll (n = 197)1996–2006 (n = 49)2007–2017 (n = 148)
N (%)N (%)N (%)
Descriptive statistics only17 (8.6)5 (10.2)12 (8.1)
Contingency tables102 (51.8)32 (65.3)70 (47.3)
Multiway tables50 (25.4)16 (32.7)34 (23.0)
Epidemiologic statistics37 (18.8)12 (24.5)25 (16.9)
t-tests82 (41.6)23 (46.9)59 (39.9)
Analysis of variance18 (9.1)1 (2.0)17 (11.5)
Simple linear regression6 (3.1)5 (10.2)1 (0.7)
Non-parametric tests48 (24.4)11 (22.5)37 (25.0)
Non-parametric correlation21 (10.7)3 (6.1)18 (12.2)
Multiple regression71 (36.0)15 (30.6)56 (37.8)
Poisson regression49 (24.9)8 (16.3)41 (27.7)
Negative binomial regression22 (11.2)3 (6.1)19 (12.8)
Survival analysis
 Kaplan–Meier estimator59 (30.0)11 (22.5)48 (32.4)
 Log-rank test36 (18.3)7 (14.3)29 (19.6)
 Cox model62 (31.5)9 (18.4)53 (35.8)
 Other survival methods4 (2.0)3 (6.1)1 (0.7)
Longitudinal analysis
 Generalized estimating equations41 (20.8)9 (18.4)32 (21.6)
 Mixed-effects regression24 (12.2)2 (4.1)22 (14.9)
Recurrent analysis
 Shared frailty model2 (1.0)2 (1.4)
 Andersen–Gill (AG) model4 (2.0)4 (2.7)