Table 2. A brief description of the 48 outcome variables included in the analysis.
| Variable | Short description | P-value | T:E- index | ||
|---|---|---|---|---|---|
| Functional tests (hops and balance) | |||||
| One-leg hop | Absolute hop length in m | 1:1 | |||
| OLH-i | Non-dominant/injured leg | 0.820 | |||
| OLH-c | Dominant/non-injured leg | 0.143 | |||
| OLH-LSI | Limb symmetry index | 0.001+ | |||
| Vertical hop | Absolute hop height in cm | 1:1 | |||
| VH-i | Non-dominant/injured leg | 0.106 | |||
| VH-c | Dominant/non-injured leg | 0.632 | |||
| VH-LSI | Limb symmetry index | 0.105 | |||
| Rise from chair | Number of rises from a chair | 1:1 | |||
| RC-i | Non-dominant/injured leg | 0.028+ | |||
| RC-c | Dominant/non-injured leg | 0.012+ | |||
| RC-LSI | Limb symmetry index | 0.690 | |||
| Side hop | Number of side hops | 1:1 | |||
| SH-i | Non-dominant/injured leg | 0.000+ | |||
| SH-c | Dominant/non-injured leg | 0.004+ | |||
| SH-LSI | Limb symmetry index | 0.004+ | |||
| One-leg balance | Number of floor-supports | 1:1 | |||
| B-i | Non-dominant/injured leg | 0.022- | |||
| B-c | Dominant/non-injured leg | 0.000- | |||
| Functional tests (strength measurements) | |||||
| Quadriceps | Concentric strength | 3:2 | |||
| Qc-i | Non-dominant/injured leg | 0.000+ | |||
| Qc-c | Dominant/non-injured leg | 0.132 | |||
| Qc-LSI | Limb symmetry index | 0.005+ | |||
| Eccentric strength | 3:2 | ||||
| Qe-i | Non-dominant/injured leg | 0.002+ | |||
| Qe-c | Dominant/non-injured leg | 0.179 | |||
| Qe-LSI | Limb symmetry index | 0.027+ | |||
| Hamstrings | Concentric strength | 3:2 | |||
| Hc-i | Non-dominant/injured leg | 0.076 | |||
| Hc-c | Dominant/non-injured leg | 0.159 | |||
| HC-LSI | Limb symmetry index | 0.401 | |||
| Eccentric strength | 3:2 | ||||
| He-i | Non-dominant/injured leg | 0.259 | |||
| He-c | Dominant/non-injured leg | 0.536 | |||
| He-LSI | Limb symmetry index | 0.255 | |||
| Strength ratios | Ratio between concentric (or eccentric) hamstrings and quadriceps strength | 3:2 | |||
| HQc-i | Non-dominant/injured leg | 0.136 | |||
| HQc-c | Dominant/non-injured leg | 0.837 | |||
| HQe-i | Non-dominant/injured leg | 0.054 | |||
| HQe-c | Dominant/non-injured leg | 0.591 | |||
| Examiner-administrated scores | |||||
| Beighton | A score measuring hypermobility | 0.020- | 1:1 | ||
| Tegner | Tegner activity scale measuring knee specific physical activity | 0.000+ | 1:1 | ||
| Lysholm | Knee function score | 0.000+ | 1:1 | ||
| Self-reported questionnaires | |||||
| KOOS | Knee injury and Osteoarthritis Outcome Score | 2:1 | |||
| KOOS-s | Symptoms | 0.000+ | |||
| KOOS-p | Pain | 0.000+ | |||
| KOOS-a | Function in activities of daily living | 0.000+ | |||
| KOOS-sp | Sports and recreation | 0.000+ | |||
| KOOS-q | Knee-related quality of life | 0.000+ | |||
| PAS | Physical Activity Scale | 0.044+ | 1:1 | ||
| IPAQ | International Physical Activity Questionnaire | 0.247 | 1:1 | ||
| SF-36 | Patient-reported survey of patient health | 2:1 | |||
| SF36-pf | Physical functioning | 0.000+ | |||
| SF36-rp | Role physical | 0.043+ | |||
| SF36-bp | Bodily pain | 0.000+ | |||
| SF36-gh | General health | 0.005+ | |||
| SF36-vt | Vitality | 0.151 | |||
| SF36-sf | Social functioning | 0.646 | |||
| SF36-re | Role emotional | 0.353 | |||
| SF36-mh | Mental health | 0.317 | |||
The P-value column states if there is a significant difference or not between individuals with ACL injury and controls, controlling for age and sex. If a significant difference is present, the symbol + indicates that the healthy-knee controls have a higher value than the ACL group while the symbol—indicates the opposite. T:E-index indicates how demanding the variable is to collect considering time (T, score 1–3) and equipment (E, score 1–2). Higher values correspond to lower feasibility.