Reliability of an observation-based scoring grid to assess bimanual performance during unstandardized tasks in adults living with cerebral palsy

Figures & data

Table 1. Interrater gwet’s AC2 per item and for the global score of the observation-based scoring grid.

Categories	Items	AC2
General usage	Initiates use	0.81
	Amount of use	0.67
	Chooses assisting hand	0.82
Arm use	Stabilizes by weight	0.93
	Reaches	0.82
	Moves upper arm	0.81
	Moves forearm	0.88
	Holds	0.97
Grasp and releases	Grasps	0.82
	Stabilizes by grasp	0.82
	Varies type of grasp	0.83
	Releases	0.86
Fine motor adjustment	Moves fingers	0.80
	Grip force regulation	0.82
	Manipulates	0.78
Coordination	Readjusts grasp	0.79
	Coordinates	0.83
	Orients objects	0.85
Pace	Proceeds	0.81
	Flow in bimanual task	0.77
Global score	Three raters	0.84
	Between experienced raters	0.92
	Between experienced rater (LGP) and naïve rater	0.80
	Between experienced rater (IP) and naïve rater	0.80

Table 2. Description of the seven tasks performed by participants.

Task	Description
Cleaning the table	Turning on a tap, filling a bowl of water, turning off the tap, wringing out a towel, and cleaning the table.
Making coffee	Opening a container, picking up a spoon, putting two spoonfuls of coffee in a cup, and closing the jar.
Setting the table	Setting a table for two, with two forks, two knives, two plates, and two glasses.
Pouring a glass of water	Turning on the tap, filling up a pitcher, turning off the tap, and pouring a glass of water.
Cutting a piece of putty	Cutting a piece of putty in 3 pieces with a knife while stabilizing with the other hand.
Folding towels	Folding two large towels and stacking them one on top of the other.
Putting toothpaste on a toothbrush	Opening a tube of toothpaste, putting a small amount of toothpaste on a toothbrush, putting the cap back on the toothpaste, and putting both objects on the table.

Table 3. Example of modification made to the scoring grid.

ORIGINAL SCORING GRID	MODIFIED SCORING GRID
Item 7. Moves forearm 3. Somewhat effective: Uses varied positions in the forearm (supination and pronation) with a large range (>90^o) but not equilaterally.	Item 7. Moves forearm 3. Somewhat effective: Uses varied positions in the forearm (supination and pronation) with a large range (>90^o) but not equilaterally. The forearm must move over 90^o of supination on a few occasions (> 2 times).

Table 4. Participants’ clinical and demographic characteristics (n = 19).

Characteristics, (n = 19)
Age, mean (SD)	34 (11.5)
Female	13 (68%)
MACS levels	I = 7
	II = 6
	III = 6
Right hemiplegia	13 (68%)

SD: standard deviation; MACS: Manual Ability Classification System.

Figure 1. Relationship between the global scores of the observation-based scoring grid and the JTHFT.

JTHFT: Jebsen-Taylor Hand Function Test; MACS: Manual Ability Classification System.

Scatter plot showing the relationship between the Observation-based Scoring Grid Global Score and the JTHFT score for each participant, along with their corresponding MACS level. A significant linear relation can be seen, indicating that as the Global Score decreases, the JTHFT score tends to increase.

Data availability statement

Due to the nature of this research (involving videos), participants of this study did not agree for their data to be shared publicly, therefore supporting data is not available.