Skip to main content

Advertisement

Springer Nature is making SARS-CoV-2 and COVID-19 research free. View research | View latest news | Sign up for updates

Table 2 Description of model fitting procedures used in four quantitative statistical models of male An. gambiae age. In all cases, the outcome variable (y) was male age group, defined as 'young' (≤ 4 days), or 'old' (> 4 days). In each model, the relationship between three explanatory variables and the outcome variables of spermatocyst number (x1), proportional size of the sperm reservoir (x2), and the presence or absence of a clear area (x3) was tested. In all models, x3 was treated as a categorical variable, with the treatment of x1 and x2 varying between models as described below (a-d representing distinct categories).

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

Quantitative Model Treatment of explanatory variables x1 & x2 No. of categories Category definitions
    Spermatocyst number (x1) % Size of sperm reservoir (x2)
Continuous Continuous n/a n/a n/a
Median Categorical 2 a = 0–2
b = 3–5
a = < 60%
b = ≥ 60%
Quartile Categorical 4 a = 0
b = 1–3
c = 4
d = 5
a = ≤ 40%
b = 41 – 59%
c = 60 – 94%
d = ≥ 95%
Break points Categorical 4 a = 0
b = 1–3
c = 4
d = 5
a = ≤ 30%
b = 31 – 60%
c = 61 – 90%
d = ≥ 91%