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Table 1 Specifications of the qualitative model for age-grading, describing the required combination of morphological traits for a male to be estimated as 'young' (≤ 4 days), or 'old' (> 4 days) under this model.

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

Number of spermatocysts Percentage of testis occupied by the sperm reservoir Clear area present Predicted age (days)
3 – 5 10 – 50% Yes or no ≤ 4
0 – 2 50 – 100% no > 4