Table 1.
Baseline characteristics stratified by baseline drinking water sources.
| Variable | Crude sample | ||
|---|---|---|---|
| To tap water (n = 11,421) | To natural water (n = 15,267) | ASD | |
| Sex: female | 6,989 (61.2) | 9,265 (60.7) | 0.010 |
| Age (years) | 91.00 (83.00, 100.00) |
91.00 (82.00, 100.00) |
0.043 |
| Education: 1 year or more | 3,410 (29.9) | 4,039 (26.5) | 0.076 |
| Marital status: not in marriage | 8,759 (76.7) | 11,546 (75.6) | 0.025 |
| Residence: rural | 6,550 (57.4) | 12,776 (83.7) | 0.603 |
| Current smoking: yes | 1,871 (16.4) | 2,935 (19.2) | 0.074 |
| Current drinking: yes | 2,295 (20.1) | 3,435 (22.5) | 0.059 |
| Current regular exercise: yes | 2,705 (23.7) | 3,052 (20.0) | 0.089 |
| Hypertension | 0.089 | ||
| No | 9,239 (80.9) | 12,533 (82.1) | |
| Yes | 1,709 (15.0) | 1,908 (12.5) | |
| Unknown | 473 (4.1) | 826 (5.4) | |
| Diabetes | 0.082 | ||
| No | 10,764 (94.2) | 14,315 (93.8) | |
| Yes | 161 (1.4) | 115 (0.8) | |
| Unknown | 496 (4.3) | 837 (5.5) | |
| Heart diseases | 0.085 | ||
| No | 10,229 (89.6) | 13,739 (90.0) | |
| Yes | 723 (6.3) | 727 (4.8) | |
| Unknown | 469 (4.1) | 801 (5.2) | |
| Cerebrovascular diseases | 0.064 | ||
| No | 10,514 (92.1) | 14,024 (91.9) | |
| Yes | 463 (4.1) | 496 (3.2) | |
| Unknown | 444 (3.9) | 747 (4.9) | |
| Respiratory diseases | 0.058 | ||
| No | 9,796 (85.8) | 12,900 (84.5) | |
| Yes | 1,227 (10.7) | 1,663 (10.9) | |
| Unknown | 398 (3.5) | 704 (4.6) | |
| Cancer | 0.079 | ||
| No | 10,869 (95.2) | 14,300 (93.7) | |
| Yes | 42 (0.4) | 33 (0.2) | |
| Unknown | 510 (4.5) | 934 (6.1) | |
Values are median (IQR) or n (%).
ASD, absolute standardized mean differences.
Because the table is too large, some baseline information was included in the Supplementary Table S3.