Correction: Quantifying Collision Frequency and Intensity in Rugby Union and Rugby Sevens: A Systematic Review

Correction to: Sports Medicine - Open (2022) 8:12 https://doi.org/10.1186/s40798-021-00398-4

The following errors are noted and corrected:

• 1. In Abstract, Results, sentence 5: ‘156.1 (121.2–191.0)’ should have been ‘171.2 (140.5–201.8)’.

• 2. In section Microtechnology, Rugby Union Training, final sentence: ‘contacts’ should have been ‘tackles’ and vice versa.

• 3. In section Video-Based Analysis, Rugby Union Match Play, sentence 3: ‘156.1 (121.2–191.0)’ should have been ‘171.2 (140.5–201.8)’.

• 4. In Table 4: The following additional data have been added to the Vaz et al. (2010) (89) row:

  Column 2: S12 competition: 95 matches;

  Column 5: 112.7 ± 33.1;

  Column 6: 99.4 ± 3.0.

The original version of Table 4 has been replaced with the version shown below:

Table 4 Characteristics of collision frequency detected by video-based analysis in rugby union and rugby sevens.

• 5. Fig. 5c: The two entries for Vaz et al. 2010 (89) have now been removed from this figure. The original version of Fig. 5 has been replaced with the version shown below:

Fig. 5

Meta-analysis of studies reporting absolute total scrums, rucks, and tackles per match (n) from video-based analysis in rugby union. The forest plot (mean and 95% confidence interval (CI)) presents the results of the meta-analysis of the pooled data estimates for the total a scrums, b rucks and c tackles per match. The squares and horizontal lines represent individual study mean and 95% CI and the diamond presents the pooled mean and 95% CI. The bigger the square the larger the sample size