Biostatistics & Research · single question

Three lasers shown: Laser 1 (negative CI, low price), Laser 2 Er:YAG (positive CI, mid price), Laser 3 (negative CI, high price). Which to recommend?

Laser 3 — highest quality
Laser 1 — cheapest
None — no laser showed significance
Laser 2 — positive CI (Er:YAG)

Show answer and explanation

Correct answer: D. Laser 2 — positive CI (Er:YAG)

CI entirely POSITIVE = statistically significant positive effect = the intervention works. Lasers 1 and 3 have negative CIs = no proven benefit. Laser 2 (Er:YAG) has positive CI = evidence of efficacy. Recommend Laser 2.

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Three lasers shown: Laser 1 (negative CI, low price), Laser 2 Er:YAG (positive CI, mid price), Laser 3 (negative CI, high price). Which to recommend?

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