Comparison of 4×2 formulas (with and without the introduction of outclassed decision) with the formulas adopted in the years immediately before and after
| 3×3 head guard (1984–1997) | 5×2 (1997–1999) | 4×2 no RSCO (2000) | 4×2 RSCO (2001–2009) | 4×2 (2000–2009) | 3×3 new (2009–2011) | |
|---|---|---|---|---|---|---|
| RSCO (%) | – | – | – | 15.49±11.21 | 10.51±11.79 | – |
| RSCI (%) | 0.72±0.84 | 1.17±1.88 | 1.13±1.97 | 1.35±1.72 | 1.28±1.79 | 1.45±1.21 |
| RSCH (%) | 4.92±5.31* | 4.23±4.92*,**,† | 0.88±1.62*** | 1.27±2.05*** | 1.41±1.62*** | 0.91±1.19*** |
| RSC (%) | 13.05±7.77* | 13.15±7.67*,**,† | 8.42±8.85*** | 5.29±6.01*** | 5.91±6.38*** | 6.29±4.47*** |
| KO (%) | 3.78±3.99* | 1.58±1.48† | 0.89±1.44 | 0.97±1.35 | 0.94±1.37 | 0.70±0.89*** |
| Points (%) | 78.76±6.77 | 74.05±9.70**,† | 82.56±8.73*,*** | 69.86±12.29† | 73.59±12.71† | 84.92±5.84* |
| RSCH+RSC+KO (%) | 21.75±10.70* | 18.92±9.69*,**,† | 10.19±10.01*** | 7.53±6.34*** | 8.27±6.90*** | 7.89±4.76*** |
*p<0.05 in comparison with 4×2 RSCO.
**p<0.05 in comparison with 4×2 no RSCO.
***p<0.05 in comparison with 5×2.
†In comparison with 3×3 new.
KO, knockout; RSC, referee stops contest for any other reason he/she believes opportune (hard blow to the body, lack of stamina, etc); RSCH, RSC due to heavy head blow(s); RSCI, RSC due to injury; RSCO, RSC due to outclassed.