Which statement by a mother indicates a need for further teaching about scoliosis screening for her 10-year-old child?

The statement indicating a need for further teaching is the one about the child standing upright with arms stretched above the head. In scoliosis screening, the child is typically asked to bend forward, allowing the examiner to observe any asymmetry in the back that may suggest curvature. This position helps in assessing any spinal deformities effectively.

Standing with arms stretched above the head is not a standard procedure in scoliosis screening, and does not provide the necessary visualization of the spine conditions that typically occur in scoliosis. The examiners primarily focus on the child's posture from the back while they are bending forward to evaluate any abnormalities.

The other statements reflect correct practices associated with scoliosis screening. Examination while sitting is not standard, but generally, screenings focus on the standing and bending forward positions. Wearing a light shirt is appropriate as it allows better visualization of the spine and any potential curvature without obscuring details. Therefore, understanding these proper procedures is important for ensuring effective screening for scoliosis in children.