Table 3. Evaluation of each question of the Spoken Knowledge in Low Literacy Patients with Diabetes and its correlation with schooling and health literacy.

SKILLD answer	Proportion of right answers (%)	Adjusted item-total correlation	Change in Cronbach	Correlation of biserial point and schooling	Correlation of biserial point and SAHLPA-18
Hyperglycemia symptoms	0.23	0.40	0.74	0.14*	0.08
Hypoglycemia symptoms	0.30	0.45	0.73	0.06*	0.10
Hypoglycemia treatment	0.65	0.50	0.72	0.22*	0.26†
Frequency of feet examination	0.35	0.44	0.73	0.28†	0.23†
Reason for feet examination	0.49	0.53	0.72	0.30†	0.33‡
Frequency of eye examination	0.67	0.46	0.73	0.28†	0.30‡
Normal values of fasting glycemia	0.55	0.43	0.73	0.28†	0.35‡
Normal values of glycosylated hemoglobin	0.11	0.40	0.74	0.47‡	0.22*
Exercise frequency	0.31	0.20	0.76	0.07*	0.04
Long-term complications	0.54	0.40	0.74	0.19*	0.17

* p value <0.05; ^† p value <0.01; ^‡ p value <0.001. SKILLD: Spoken Knowledge in Low Literacy Patients with Diabetes; SAHLPA-18: Short Assessment of Health Literacy for Portuguese-speaking Adults-18.