Table 1.
Characteristics of participants in the prematched and postmatched samples
| Group Independents |
Prematched sample | Postmatched sample | ||||||||
| Intervention (n=92 522) |
Control (n=2 80 916) |
SMD | Intervention (n=86 581) |
Control (n=86 581) |
SMD | |||||
| n | % | n | % | n | % | n | % | |||
| Gender | ||||||||||
| Male | 47 401 | 51.2 | 153 783 | 54.7 | 0.07 | 44 821 | 51.8 | 44 821 | 51.8 | 0.00 |
| Female | 45 121 | 48.8 | 127 133 | 45.3 | 41 760 | 48.2 | 41 760 | 48.2 | ||
| Age (years) | ||||||||||
| ≤55 | 22 421 | 24.2 | 85 743 | 30.5 | 0.14 | 21 087 | 24.4 | 21 087 | 24.4 | 0.00 |
| 56–65 | 28 021 | 30.3 | 64 894 | 23.1 | 0.16 | 25 686 | 29.7 | 25 686 | 29.7 | 0.00 |
| 66–75 | 26 189 | 28.3 | 61 503 | 21.9 | 0.14 | 24 222 | 28.0 | 24 222 | 28.0 | 0.00 |
| 76+ | 15 891 | 17.2 | 68 776 | 24.5 | 0.17 | 15 586 | 18.0 | 15 586 | 18.0 | 0.00 |
| First year in early-CKD programme | ||||||||||
| 2011 | 21 542 | 23.3 | 71 104 | 25.3 | 0.04 | 19 269 | 22.3 | 19 269 | 22.3 | 0.00 |
| 2012 | 28 908 | 31.2 | 88 203 | 31.4 | 0.00 | 27 561 | 31.8 | 27 561 | 31.8 | 0.00 |
| 2013 | 42 072 | 45.5 | 121 609 | 43.3 | 0.04 | 39 751 | 45.9 | 39 751 | 45.9 | 0.00 |
| CCI index score | ||||||||||
| 0 | 16 836 | 18.2 | 96 468 | 34.3 | 0.37 | 16 711 | 19.3 | 16 928 | 19.6 | 0.00 |
| 1–2 | 46 667 | 50.4 | 103 518 | 36.9 | 0.27 | 42 428 | 49.0 | 41 919 | 48.4 | 0.01 |
| ≥3 | 29 019 | 31.4 | 80 930 | 28.8 | 0.05 | 27 442 | 31.7 | 27 734 | 32.0 | 0.00 |
| Comorbidity | ||||||||||
| Diabetes | 58 357 | 63.1 | 113 852 | 40.5 | 0.46 | 52 642 | 60.8 | 52 240 | 60.3 | 0.01 |
| Hypertension | 64 396 | 69.6 | 152 667 | 54.3 | 0.32 | 59 414 | 68.6 | 60 219 | 69.6 | 0.02 |
| Cardiovascular diseases | 25 137 | 27.2 | 74 224 | 26.4 | 0.01 | 23 817 | 27.5 | 24 062 | 27.8 | 0.00 |
| Hospital accreditation level | ||||||||||
| Medical centre | 14 371 | 15.5 | 67 815 | 24.1 | 0.21 | 12 067 | 13.9 | 12 067 | 13.9 | 0.00 |
| Regional hospital | 25 014 | 27.0 | 100 071 | 35.6 | 0.18 | 23 778 | 27.5 | 23 778 | 27.5 | 0.00 |
| District hospital | 12 944 | 14.0 | 44 73 | 15.9 | 0.05 | 12 507 | 14.4 | 12 507 | 14.4 | 0.00 |
| Community clinic/unclear | 40 193 | 43.4 | 68 292 | 24.3 | 0.41 | 38 229 | 44.2 | 38 229 | 44.2 | 0.00 |
| Hospital location | ||||||||||
| Taipei region | 3918 | 4.2 | 70 485 | 25.1 | 0.61 | 3915 | 4.5 | 3915 | 4.5 | 0.00 |
| Northern region | 5636 | 6.1 | 25 972 | 9.2 | 0.11 | 5601 | 6.5 | 5601 | 6.5 | 0.00 |
| Central region | 19 450 | 21.0 | 44 338 | 15.8 | 0.13 | 17 101 | 19.8 | 17 101 | 19.8 | 0.00 |
| Southern region | 8600 | 9.3 | 33 427 | 11.9 | 0.08 | 7876 | 9.1 | 7876 | 9.1 | 0.00 |
| Kaohsiung/Pingtung region | 14 105 | 15.2 | 32 850 | 11.7 | 0.10 | 13 269 | 15.3 | 13 269 | 15.3 | 0.00 |
| Eastern region | 625 | 0.7 | 5809 | 2.1 | 0.11 | 593 | 0.7 | 593 | 0.7 | 0.00 |
| Unclear | 40 188 | 43.4 | 68 035 | 24.2 | 0.41 | 38 226 | 44.2 | 38 226 | 44.2 | 0.00 |
Standardised mean difference (SMD)=difference in mean outcome between groups/SD of outcome among participants; SMD >0.1 means there is a significant difference.
CCI, Charlson Comorbidity Index; CKD, chronic kidney disease.