Technology experience and skills is the potential confounder between the association of age group and contact pattern. Below is the clarification.
Firstly, the level of technology experiences and skills could impact the contact pattern. People with previous experience and skills in using applications, for example, experience in using different kinds of application in daily life, would possibly accept and use the application more than people who have less experience and skills in technology. This can create a higher effect towards active contact pattern.
Secondly, the level of technology experience and skills has association with age groups. The number of people who have great experience and skills in using applications would vary in different age groups. The young adults’ group might contain more people who are familiar to the technology compared to other groups such as elderly.
Lastly, technology experience and skills isn’t the by-product between age group and contact pattern.