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Table 2 Numbers of participants (and response rates) for the randomized samples in each region.

From: Systematic investigation of gastrointestinal diseases in China (SILC): validation of survey methodology

 

Shanghai

Beijing

Wuhan

Xi'an

Guangzhou

Total

Total sample

3153 (87.6%)a

3171 (88.1%)

3291 (91.4%)

3266 (90.7%)

3210 (89.2%)

16 091 (89.4%)

80% sub-sample

2510 (87.2%)a

2579 (89.5%)

2615 (90.8%)

2622 (91.0%)

2546 (88.4%)

12 872 (89.4%)

• General information questionnaire

      

• RDQ

      

• Modified Rome II questionnaire

      

20% sub-sample

643 (89.3%)a

592 (82.2%)

676 (93.9%)

644 (89.4%)

664 (92.2%)

3219 (89.4%)

• General information questionnaire

      

• RDQ

      

• Modified Rome II questionnaire

      

• SF-36

      

• ESS

      

• Physical examination

      
  1. ESS, Epworth Sleepiness Scale; GI, gastrointestinal; RDQ, Reflux Disease Questionnaire; SF-36, 36-item Short-Form Health Survey.
  2. aIn Shanghai, all 3153 respondents to the initial survey underwent blood sampling (100% response rate), and 1030 participants (32.7%) accepted the invitation to undergo upper gastrointestinal endoscopy with esophageal biopsy, 764 (30.4%) in the 80% sub-sample and 266 (41.4%) in the 20% sub-sample