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Table 5 Number of question-answer responses collected for each question and user type

From: Evaluating smartphone-based dynamic security questions for fallback authentication: a field study

Question type Number of response collected
Legitimate Strong Naive
Call 288 267 235
SMS 523 488 406
Location 480 452 388
Activity 347 289 271
Battery 416 346 313
App 437 349 308
Music 374 362 333
Total 2865 2553 2254