An erratum is being issued to an article published in 2020 in the International Journal of Exercise Science. The article is entitled “Effect of Chronotype on Sleep Quality in a Laboratory Setting,”: 13(3): 1283–1294, 2020. DOI: https://doi.org/10.70252/EJIJ5619
The initial publication listed incorrect values in Table 4.
The version of Table 4 published with this erratum is correct.
Table 4.
Group differences for early/normal/late chronotype and lesser/greater sleep discrepancy (SD).
| Nominal Data (Y/N) | Interval Data (mean ± std. dev.) | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Diff. falling asleep? | Diff. staying asleep? | Refresh. sleep? | Bothered during night? | Rep. sleep duration | Total sleep time | % Deep sleep | REM sleep | WASO | ||
| Chronotype | Early | 1/3 | 3/1 | 3/1 | 1/1 | 6.63 ± 0.95 | 413.13 ± 89.66 | 20.40 ± 11.29 | 22.83 ± 4.16 | 2.50 ± 1.73 |
| Normal | 1/2 | 1/1 | 1/1 | 1/5 | 6.17 ± 1.13 | 424.42 ± 93.77 | 18.61 ± 12.35 | 21.98 ± 12.36 | 1.83 ± 1.60 | |
| Late | 1/1 | 7/3 | 4/1 | 1/4 | 6.70 ± 1.09 | 396.50 ± 68.76 | 19.10 ± 6.14 | 27.29 ± 11.79 | 3.00 ± 1.94 | |
| p-value | 0.72 | 0.70 | 0.47 | 0.52 | 0.62 | 0.79 | 0.96 | 0.60 | 0.47 | |
| SD | Lesser | 4/8 | 7/5 | 6/6 | 3/9 | 6.75 ± 0.99 | 430.00 ± 76.19 | 17.41 ± 7.23 | 23.35 ± 8.70 | 2.25 ± 1.48 |
| Greater | 4/4 | 6/2 | 8/0 | 2/6 | 6.19 ± 0.97 | 375.50 ± 60.99 | 21.9 ± 9.80 | 29.88 ± 12.35 | 2.75 ± 1.88 | |
| p-value | 0.65 | 0.64 | 0.042* | 1.00 | 0.24 | 0.13 | 0.28 | 0.21 | 0.56 | |
Nominal (Y/N) data is reported as frequencies while interval data is reported as mean (standard deviation).
For comparing early/normal/late chronotype groups, nominal data was analyzed using a Chi-square test for association and interval data was analyzed using one-way ANOVA. When assessing lesser/greater SD groups, nominal data was analyzed using Fisher’s exact test and interval data was analyzed using Student’s t-test. (*p < 0.05). Abbreviations are as follows: diff. = difficulty, refresh. = refreshing.