Table 2.

Attrition of survey respondents

Original (and subsequent) number of respondents	Number of respondents excluded at each stage, with reasons
4018 ↓	→	2 (0.1%) were aged 0–19 years
4016 ↓	→	1 (0.0%) was not a permanent resident of Japan
4015 ↓	→	0 (0.0%) were not able to read and understand the Japanese language
4015 ↓	→	206 (5.1%) had been diagnosed with type 1 diabetes or gestational diabetes
3809 ↓	→	1103 (29.0%) did not take oral medications to control blood glucose level, or took a combination of oral and injectable medications
2706 ↓	→	20 (0.7%) had been taking oral medications for only 0–5 months
2686 ↓	→	424 (15.8%) had received injectable medications to control blood glucose level
2262 ↓	→	1409 (62.3%) had a most recent measured HbA1c level below 7.0%, or did not know a measured HbA1c level from within the past year
853 ↓	→	34 (4.0%) had health issues that made it difficult to participate in the survey
819 ↓	→	11 (1.3%) worked for a pharmaceutical company, or were employed in a position where they directly treated patients with diabetes
808 ↓	→	249 (30.8%) did not wish to participate in the survey
559 ↓	→	38 (6.8%) incorrectly answered the test choice set
521 ↓	→	21 (4.0%) selected treatment A in all choice sets, or treatment B in all choice sets
500 respondents (final analysis sample)

HbA_1c glycated haemoglobin