A comparison chart shows 3 laser types: Laser 1 (negative CI, low price), Laser 2 — Erbium:YAG (positive CI, middle price), Laser 3 (negative CI, high price). Which laser should be recommended?

When a confidence interval is positive (above zero), it indicates that the intervention has a statistically significant beneficial effect — the treatment works better than the control. Laser 2 (Erbium:YAG) with a positive CI is the ONLY laser that demonstrated a statistically significant benefit. Lasers 1 and 3 have negative CIs (confidence intervals crossing or below zero), indicating no statistically significant benefit or possible harm — regardless of price. Evidence-based decision: use the one that works.