Table 3.
Gross motor (GM) units for each item on the GMFM.
| Item Number | Item Name | Observed Difficulty | Gross Motor (GM) units |
|---|---|---|---|
| *2 | SUP: BRINGS HANDS TO MIDLINE | 14.13 | 0 |
| 6 | SUP: R HAND CROSSES MIDLINE | 14.13 | 0 |
| 7 | SUP: L HAND CROSSES MIDLINE | 14.13 | 0 |
| 10 | PR: LIFTS HEAD UPRIGHT | 21.5 | 15 |
| 22 | LIFTS HEAD TO MIDLINE | 22.73 | 18 |
| 21 | SIT: LIFTS HEAD UPRIGHT | 22.73 | 18 |
| 23 | SIT: ARMS PROPPING | 26.45 | 26 |
| 18 | SUP: PULLS TO SITTING | 27.66 | 28 |
| 24 | SIT: ARMS FREE | 36.31 | 46 |
| 25 | SIT: WITH TOY | 36.31 | 46 |
| 34 | SIT: ARMS & FEET FREE | 36.31 | 46 |
| 27 | SIT: REACH BEHIND TO L | 36.31 | 46 |
| 26 | SIT: REACH BEHIND TO R | 36.31 | 46 |
| 39 | 4-POINT: MAINTAINS 4PT | 37.54 | 49 |
| 30 | SIT: LOWERS TO PRONE | 39.94 | 54 |
| 52 | ON FLOOR: PULL TO STAND AT BENCH | 42.28 | 59 |
| 41 | PRN: ATTAINS 4PT | 42.38 | 59 |
| 40 | 4-POINT: ATTAINS SIT | 42.38 | 59 |
| 32 | SIT ON MAT: TO 4PT OVER L SIDE | 42.38 | 59 |
| 53 | STD: ARMS FREE, 3 SEC | 42.46 | 59 |
| 56 | STD: ARMS FREE 10 SEC | 42.46 | 59 |
| 31 | SIT ON MAT: TO 4PT OVER A SIDE | 43.61 | 62 |
| 43 | 4-POINT: REACHES WITH L | 44.82 | 64 |
| 42 | 4-POINT: REACHES WITH R | 44.82 | 64 |
| 44 | 4-POINT: CRAWLS FORWARD 1.6m | 46.03 | 67 |
| 45 | 4-POINT: CRAWLS RECPRCLLY 1.0m | 46.03 | 67 |
| 46 | 4-POINT: CRAWL UP 4 STEPS | 46.03 | 67 |
| 65 | STD: CRUISE TO R WITH BENCH | 48.35 | 72 |
| 66 | STD: CRUISE TO L WITH BENCH | 48.35 | 72 |
| 48 | SIT ON MAT: ATTAIN HIGH KN ARMS FREE | 48.47 | 72 |
| 36 | ON FLOOR: ATTAINS SIT SMALL BENCH | 49.7 | 74 |
| 37 | ON FLOOR: ATTAINS SIT LARGE BENCH | 49.7 | 74 |
| 67 | STD: WALK WITH HANDS HELD | 52.02 | 79 |
| 59 | SIT BENCH: ATTAINS STD ARMS FREE | 53.35 | 82 |
| 35 | STD: ATTAINS SIT | 54.56 | 84 |
| 62 | STD: LOWERS TO SIT, ARMS FREE | 54.56 | 84 |
| 51 | HIGH KN: KN WALK FORWARD | 55.73 | 87 |
| 61 | HIGH KN: TO STAND L SIDE | 55.77 | 87 |
| 60 | HIGH KN: TO STAND A SIDE | 55.77 | 87 |
| 68 | STD 1 HAND HELD: WALK WITH 1 HAND HELD | 56.95 | 89 |
| 54 | STD: LIFT R FOOT | 59.37 | 95 |
| 55 | STD, LIFT L FOOT | 59.37 | 95 |
| 63 | STD: TO SQUAT, ARMS FREE | 59.4 | 95 |
| 64 | STD: PICK UP OBJ ARMS FREE | 59.4 | 95 |
| 84 | STD, HOLDING 1 RAIL: UP 4 STEPS | 60.58 | 97 |
| 85 | STD: DOWN 4 STEPS HLDING RAIL | 61.79 | 100 |
| * 69 | STD: WALK, HANDS FREE | 61.88 | 100 |
| 70 | STD: WALK 10 STEPS, RETURN | 64.3 | 105 |
| 72 | STD: WALK WITH OBJECT HELD | 64.3 | 105 |
| 57 | STD: LIFT LFT ARMS FREE | 64.3 | 105 |
| 58 | STD: LIFT RFT ARMS FREE | 64.3 | 105 |
| 71 | STD: WALK BACKWARD 10 STEPS | 64.3 | 105 |
| 73 | STD: WALK BETWEEN LINES | 64.3 | 105 |
| 75 | STD: STEP OVER STICK, A FOOT | 64.3 | 105 |
| 76 | STD: STEP OVER STICK, L FOOT | 64.3 | 105 |
| 74 | STD: WALK ALONG STRAIGHT LINE | 64.3 | 105 |
| 86 | STD: UP 4 STEPS, NO RAIL | 65.51 | 107 |
| 87 | STD: DOWN 4 STEPS, NO RAIL Difficult | 66.72 | 110 |
| 78 | STD: KICK BALL, R FOOT | 67.93 | 112 |
| 79 | STD: KICK BALL, L FOOT | 67.93 | 112 |
| 77 | STD: RUN 4.5m, RETURN | 70.37 | 118 |
| 80 | STD: JUMP UP 30cm BOTH FEET | 71.58 | 120 |
| 81 | STD: JUMP FWD 30cm BOTH FEET | 71.58 | 120 |
| 88 | STD 6" STEP: JUMP OFF 15cm STP 2 FEET | 71.58 | 120 |
| 82 | STD L FOOT: HOP 10X, R FOOT | 72.79 | 123 |
| 83 | STD L FOOT: HOP 10X, L FOOT | 72.79 | 123 |
Table 3 presents the observed task difficulty and measure in Gross Motor (GM) units for each item on the GMFM. Items are ordered based on GM units. Less GM units indicate easier task difficulty and more GM units indicate harder task difficulty. Reference points for anchors are denoted with *. GM units are derived from predicted task difficulty calculated by the specification equation based on theory.