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Table 3 Comparative success of four different statistical models aiming to predict male An. gambiae age group as a function of their reproductive morphology (Table 2). Overall success indicates the percent of a given data set (original or blind trial) whose age-grade was correctly predicted by the model; with age-specific success indicating the proportion of 'young' and 'old' males correctly classified within these groups.

From: A reliable morphological method to assess the age of male Anopheles gambiae

Quantitative Model Proportion of variation explained (original data) Percent of data classified into the correct age groups (%)
   Original Data Set Blind Trial Data Set
  (r2) Overall success Age group Age-specific Success Overall Success Age group Age-specific success
Continuous 0.78 90.5 ≤ 4
> 4
90.7
90.3
76 ≤ 4
> 4
60
89
Median 0.73 88.1 ≤ 4
> 4
92.6
84.0
81 ≤ 4
> 4
66
93
Quartile 0.79 90.3 ≤ 4
> 4
89.8
90.8
86 ≤ 4
> 4
74
95
Break points 0.78 90.3 ≤ 4
> 4
89.8
90.8
89 ≤ 4
> 4
81
95