Table 2 Example items and response categories.

Questionnaire	Example item	Response categories
CHQ‐CF87	Have you been limited in the past 4 weeks in any of the following ways due to problems with your	1 = yes, very limited
	behaviour: limited in the kind of schoolwork or activities with friends you could do?	2 = yes, limited
		3 = yes, a bit limited
		4 = no, not limited
	In the past month, how much of a problem has this been for you…
PedsQL 4.0	Other kids don't want to be my friend.	0 = never
PedsQL‐DM	My parents and I argue about my diabetes care.	1 = almost never
		2 = sometimes
		3 = often
		4 = almost always
	During the past week…
KINDL‐R	I got on well with my parents.	1 = never
KINDL‐R‐DM	I would best of all have liked to “stuff my face” with my favourite foods.	2 = rarely
		3 = sometimes
		4 = often
		5 = all the time
	Think about the past 4 weeks:
DISABKIDS	Do you feel lonely because of your condition?	1 = never
DISABKIDS‐DM	Does diabetes rule your day?	2 = seldom
		3 = quite often
		4 = very often
		5 = always
DQOL‐Youth	How often are you teased because you have diabetes?	1 = never
		2 = very seldom
		3 = sometimes
		4 = often
		5 = all the time
ADDQoL‐Teen	A: “Do you ever want to eat something but you don't eat it because of your diabetes?	Yes—a lot
		Yes—a fair bit
		Yes—a bit
		No—I do not
	B: “Does it bother you when you want to eat something but you don't because of your diabetes?”	Yes—It bothers me very much
		Yes—It bothers me a fair bit
		No—It doesn't bother me, it's OK
		No—It doesn't bother me, I like it