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| Project | Group 1 (normal) | Group 2 (mild CHD) | Group 3 (moderate CHD) | Group 4 (severe CHD) | P value |
|---|---|---|---|---|---|
| No. of subjects | 412 | 288 | 200 | 100 | – |
| DLP (mGy·cm) | 84.6±12.4 | 96.8±14.2 | 112.4±16.3 | 132.6±18.7 | <0.05 |
| ED (mSv) | 1.2±0.2 | 1.4±0.2 | 1.6±0.2 | 1.9±0.3 | <0.05 |
Data are presented as mean ± standard deviation or number. CHD, coronary heart disease; DLP, dose-length product; ED, effective dose.
