For patients with carpometacarpal joint osteoarthritis,
Rosengren and Brodin (2013) determined a median quickDASH
score of 37.0, which is similar to our value. Problems with opening
glass jars have been described in previous studies (Marks et al.,
2012). Kozak et al. (2003) included glass jars in their analysis. The
155 Japanese people surveyed were very critical of this type of
packaging, not least because of the strength they needed to open it.
In their study, Winder et al. (2002) found that more than 20% of
healthy people were not strong enough to open flexible packaging.
From our results, we can confirm that patients with stronger hands
are more likely to be able to open peelable packaging.