Abstract
Objective To analyze the bias of dimension measurement results of penis and testis by the self-design cylinder boy penis and testicles measurement (hereinafter called cylinder ruler) and it influencing factors. Methods From June to December 2018, we selected 152 children of Department of Urinary Surgery in Hu'nan Children's Hospital as subjects by case sampling. Children's penis and testicles dimension were measured repeatedly by their patients and nurses with the self-designed cylinder ruler and three kinds of common clinical measurement tools (vernier caliper+tape measure+testis measurer, vernier caliper+straightedge, vernier caliper+round head probe) , and the bias were counted based on medical reference value. Results Measurement bias of length and diameter of penis in a resting state, length of penis in a traction state, length and width of testis in group of cylinder ruler were lower than those in other groups with statistical differences (P 0.05) . Bias of length of penis in a traction state, length and width of testis measured by nurses were lower than those by children's patients with statistical differences (P 0.05) ; however, there were statistical differences in dimension of penis and testis measured with the cylinder ruler by different measurers at different times of a day (P<0.05) . The differences of interaction effects between measurement time and measurers were statistical (P<0.05) . Conclusions Compared with other measurements, the self-designed cylinder ruler for measurement of penis and testis in boys has higher accuracy. The main influencing factors of bias of dimension of boys' penis and testis are ages of boys and measurement time. Bias of length of penis in a traction state, length and width of testis measured by nurses are lower than those by children's patients. Measurers and measurement time are not suggested as independent factors when analyzing the influencing factors of dimensions measurement bias of penis and testis. Dimensions of penis and testis are measured with the cylinder ruler at different times which have certain changes. Key words: Child; Penis; Testis; Measurement; Bias
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