Frequency of errors (item non-response and implausible or improbable responses) in reporting physical activity with the WHO GPAQ questionnaire (N = 14706).

* Number of item non-responses.† Cumulative number of different respondents.‡ Reported physical activity ˃112 hours per week (7 days × 16 hours/day), in near accordance with Global Physical Activity Questionnaire Analysis Guide.§ Number of item non-responses and implausible values.¶ Number of item non-responses, implausible values and improbable values.**Energy expenditure from reported activity > average energy intake per day of Vietnamese people (2100 kcal).Frequency of errors (item non-response and implausible or improbable responses) in reporting physical activity with the WHO GPAQ questionnaire (N = 14706).