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| Outcome or subgroup title | No. of studies | No. of participants | Statistical method | Effect size |
|---|---|---|---|---|
| 1 PIPP | 1 | 47 | Mean Difference (IV, Fixed, 95% CI) | ‐1.75 [‐2.22, ‐1.28] |
| 1.1 Preterm infants | 1 | 47 | Mean Difference (IV, Fixed, 95% CI) | ‐1.75 [‐2.22, ‐1.28] |
| 2 Comfort score | 1 | 47 | Mean Difference (IV, Fixed, 95% CI) | ‐2.60 [‐3.06, ‐2.14] |
| 2.1 Preterm infants | 1 | 47 | Mean Difference (IV, Fixed, 95% CI) | ‐2.60 [‐3.06, ‐2.14] |
