Table 3.

Responses to statements in usability questionnaire among adolescents after using the Technology Assisted Dietary Assessment iPhone (n=40).

Statement, as presented		Agreed by boysa n (%)	Agreed by girlsb n (%)
I found the fiducial marker easy to
	Use	21 (91)	11 (65)
	Carry around	20 (87)	11 (65)
	Include in the picture of my meals	20 (87)	12 (71)
Understanding the purpose of the TADA iPhone app would have been helpful		20 (87)	17 (100)
Carrying 2 telephones is easy (n=31c)		16 (84)	12 (100)

^aBoys (n) = 23

^bGirls (n) = 17

^cRefers to carrying TADA iPhone and the personal mobile phone. The numbers of boys and girls who were carrying both were 19 and 12, respectively.