Characteristics of studies included in the systematic review and/or meta-analysis
| Reference | Country | Study design | Population | Surgical intervention | Outcome | Postoperative speech language therapy | |||||
| Sample size | Sample age | Categories | Feeding improving | Tongue protrusion | Nipple pain | ||||||
| First author’s name and year of publication | Country | Design of the study | Number of participants | Age of participants (years) | Different surgical methods (laser, Z-plasty, total excision of frenulum) | Compare the pre-surgical and post-surgical procedure | Compare the pre-surgical and post-surgical procedure | Pain score (VAS, NRS) | Yes | No | Not informed |
NRS, Numerical Rating Scale; VAS, Visual Analogue Scale.