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Table 2 Answers to questionnaire assessing knowledge on oral anticoagulation therapy (n = 345)

From: Safety relevant knowledge of orally anticoagulated patients without self-monitoring: a baseline survey in primary care

#   Correct answer Correct n (%) Incorrect* n (%) Score
1 Indication for OAT known Individual 329 (95%) 16 (5%) 1
2 Awareness of risk treated with OAT Individual 278 (81%) 67 (19%) 1
3 Duration of treatment known Individual 249 (72%) 96 (28%) 1
4 Frequency of controls known Individual 278 (81%) 67 (19%) 1
5 Awareness of target INR range Individual 158 (46%) 187 (54%) 1
6 Need to follow a specific diet     
  Overall   107 (31%) 238 (69%) 1
  • Consuming large amounts of salad and vegetables No   11 (3%) 0
  • Avoid salad and vegetables No   57 (17%) 0
  • Regular diet of salad and vegetables Yes 107 (31%)   1
  • Do not know No   170 (49%) 0
7 Vitamin K content of some foods     
  Overall     1
  • Cabbage Yes 245 (71%) 100 (29%) 1/8
  • Potatoes No 283 (82%) 62 (18%) 1/8
  • Apples No 284 (82%) 61 (18%) 1/8
  • Green salad Yes 155 (45%) 190 (55%) 1/8
  • Tomato extract No 260 (75%) 85 (25%) 1/8
  • Spinach No 164 (48%) 181 (52%) 1/8
  • Onion Yes 37 (11%) 308 (89%) 1/8
  • Zucchini No 268 (78%) 77 (22%) 1/8
8 Management of missed medication dose n.a. 46 (13%) 299 (87%) 1
9 Awareness that there are no symptoms of underdosing n.a. 194 (56%) 151 (44%) 1
10 Safest over the counter pain medication     
  Overall   68 (20%) 277 (80%) 1
  • Paracetamol/acetaminophen Yes 68 (20%)   1
  • Aspirin (acetylsalicylic acid) No   21 (6%)  
  • Other non-steroidal anti-inflammatory drugs No   37 (11%)  
  • Do not know No   219 (63%)  
11 Interaction with OAT     
  Overall     1
  • Regular exercise No 264 (77%) 81 (23%) 1/8
  • Gastroenteritis Yes 60 (17%) 285 (83%) 1/8
  • Fever Yes 16 (5%) 328 (95%) 1/8
  • Coffee No 327 (95%) 18 (5%) 1/8
  • Ginkgo biloba Yes 16 (5%) 329(95%) 1/8
  • Non-prescription drugs Yes 71 (21%) 274 (79%) 1/8
  • Moderate intake of alcohol No 272 (79%) 73 (21%) 1/8
  • Fasting/weight reduction diet Yes 48 (14%) 297 (86%) 1/8
12 Recognition of emergency situations     
  Overall     1
  • Painful swelling with or without skin discoloration Yes 95 (28%) 250 (72%) 1/5
  • Sudden speech disorder Yes 169 (49%) 176 (51%) 1/5
  • Black stool (melaena) Yes 133 (39%) 212 (61%) 1/5
  • Arm weakness (also temporarily) Yes 85 (25%) 260 (75%) 1/5
  • Every cut or injury with bleeding Yes 224 (65%) 121 (35%) 1/5
13 Important situation to inform others about OAT     
  Overall     1
  • Dental visits Yes 312 (90%) 33 (10%) 1/5
  • Pharmacist Yes 93 (27%) 252 (73%) 1/5
  • Before injections Yes 156 (45%) 189 (55%) 1/5
  • Any new prescription medication Yes 191 (55%) 154 (45%) 1/5
  • Before invasive medical procedures Yes 305 (88%) 40 (12%) 1/5
     Maximum score 13
  1. OAT oral anticoagulation therapy, n.a. non applicable. *non-response was treated as incorrect answer.