Concurrent Validity Between Live and Home Video Observations Using the Alberta Infant Motor Scale.
Marike Boonzaaijer, Ellen van Dam, Ingrid C van Haastert and 1 others
PMID 28350771WHAT IT FOUND
The average gap between home video and live Alberta Infant Motor Scale scores was 0.46 items on a 58-item scale, and the methods did not consistently differ.
Home video scores were close to live scores.
Key findings
01The average difference between live and home video AIMS raw scores was 0.46 items, and the two methods did not consistently differ.
02Total AIMS scores agreed very strongly between live and video observation, with an intraclass correlation of 0.99 and a measurement error of 1.41 items.
03Parents reported the video was feasible: 94% said recording was easy and 96% said making the home video was easy.
STILL TO COME
How it was doneWhat they foundWhat it means for PTs
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What it does not show
The study used convenience sampling and excluded infants with known abnormal movement patterns. It does not show the method works for infants already suspected of motor problems. Only 48 infants were analysed. Age group 2 had 12 infants and the lowest agreement, with an intraclass correlation of 0.89. Almost 75% of parents had advanced education, and 86% of questionnaires were completed by mothers. Feasibility may not apply to all families. Four videos were excluded for procedure failures. In a few cases, the live and video assessments could lead to different advice to parents. The live observation was assumed to be the gold standard, but the authors said it was not always better than the video. They interpreted validity with caution.
The easy way to misread this
Do not treat the video method as proven for all infants or for untrained testers. The study used infants without known abnormal movement patterns, a small convenience sample, and the authors questioned the live observation gold standard.