Covariates | Before matching | Ļ2 | P Value | After matching | Ļ2 | P Value | ||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
Anemia | Non-Anemia | Anemia | Non-Anemia | |||||||||
(Nā=ā342) | (Nā=ā663) | (Nā=ā310) | (Nā=ā310) | |||||||||
Gender | ||||||||||||
Male | 74 | 21.64% | 134 | 20.21% | 0.28 | 0.00 | 68 | 21.94% | 76 | 24.52% | 0.579 | 0.253 |
Female | 268 | 78.36% | 529 | 79.79% | Ā | Ā | 242 | 78.06% | 234 | 75.48% | Ā | Ā |
Age group(y) | ||||||||||||
āā¤ā60 | 40 | 11.70% | 113 | 17.04% | 13.53 | 0.01 | 32 | 10.32% | 30 | 9.68% | 0.133 | 0.717 |
60ā70 | 134 | 39.18% | 301 | 45.40% | Ā | Ā | 127 | 40.97% | 125 | 40.32% | Ā | Ā |
ā>ā70 | 168 | 49.12% | 249 | 37.56% | Ā | Ā | 151 | 48.71% | 155 | 50.00% | Ā | Ā |
BMI (kg/m2) | ||||||||||||
ā<ā18.5 | 11 | 3.22% | 4 | 0.60% | 15.49 | 0.00 | 3 | 0.97% | 8 | 2.58% | 2.459 | 0.483 |
18.5ā24.9 | 176 | 51.46% | 309 | 46.61% | Ā | Ā | 162 | 52.26% | 156 | 50.32% | Ā | Ā |
25ā29.9 | 125 | 36.55% | 264 | 39.82% | Ā | Ā | 117 | 37.74% | 116 | 37.42% | Ā | Ā |
āā„ā30 | 30 | 8.77% | 86 | 12.97% | Ā | Ā | 28 | 9.03% | 30 | 9.68% | Ā | Ā |
ABO blood type | ||||||||||||
type A | 113 | 33.04% | 228 | 34.39% | 2.242 | 0.524 | 30 | 9.68% | 32 | 10.32% | 0.133 | 0.936 |
type B | 78 | 22.81% | 166 | 25.04% | Ā | Ā | 125 | 40.32% | 127 | 40.97% | Ā | Ā |
type AB | 31 | 9.06% | 45 | 6.79% | Ā | Ā | 155 | 50.00% | 151 | 48.71% | Ā | Ā |
type O | 120 | 35.09% | 224 | 33.79% | Ā | Ā | Ā | Ā | Ā | Ā | Ā | Ā |
Hypertension | ||||||||||||
Yes | 123 | 35.96% | 268 | 40.42% | 1.886 | 0.096 | 113 | 36.45% | 119 | 38.39% | 0.248 | 0.678 |
No | 219 | 64.06% | 395 | 59.58% | Ā | Ā | 197 | 63.55% | 191 | 61.61% | Ā | Ā |
DM | ||||||||||||
Yes | 37 | 10.82% | 101 | 15.23% | 3.71 | 0.032 | 38 | 12.26% | 33 | 10.65% | Ā | Ā |
No | 305 | 89.18% | 562 | 84.77% | Ā | Ā | 272 | 87.74% | 277 | 89.35% | Ā | Ā |
CHD | ||||||||||||
Yes | 26 | 7.60% | 38 | 5.73% | 1.324 | 0.155 | 22 | 7.10% | 26 | 8.39% | 0.364 | 0.653 |
No | 316 | 92.40% | 625 | 94.27% | Ā | Ā | 288 | 92.90% | 284 | 91.61% | Ā | Ā |
History of major surgery in the last 12Ā months | ||||||||||||
Yes | 12 | 3.51% | 19 | 2.87% | 0.312 | 0.351 | 9 | 2.90% | 8 | 2.58% | 0.06 | 0.5 |
No | 330 | 96.49% | 644 | 97.13% | Ā | Ā | 301 | 97.10% | 302 | 97.42% | Ā | Ā |
ChronicĀ bronchitis | ||||||||||||
Yes | 6 | 1.75% | 7 | 1.06% | 0.862 | 0.258 | 5 | 1.61% | 5 | 1.61% | 1 | 0.624 |
No | 336 | 98.25% | 656 | 98.94% | Ā | Ā | 305 | 98.39% | 305 | 98.39% | Ā | Ā |
Cerebral infarction | ||||||||||||
Yes | 11 | 3.22% | 12 | 1.81% | 1.996 | 0.118 | 9 | 2.90% | 8 | 2.58% | 0 | 1 |
No | 331 | 96.78% | 651 | 98.19% | Ā | Ā | 301 | 97.10% | 302 | 97.42% | Ā | Ā |
Classification of OA | ||||||||||||
RA | 37 | 10.82% | 16 | 2.41% | 31.909 | 0.001 | 16 | 5.16% | 16 | 5.16% | 0 | 1 |
OA | 305 | 89.18% | 647 | 97.59% | Ā | Ā | 294 | 94.84% | 294 | 94.84% | Ā | Ā |
History of drinking | ||||||||||||
Yes | 4 | 1.17% | 24 | 3.62% | 5.001 | 0.016 | 4 | 1.29% | 6 | 1.94% | 0.84 | 0.5 |
No | 338 | 98.93% | 639 | 96.38% | Ā | Ā | 306 | 98.71% | 304 | 98.06% | Ā | Ā |
History of Smoking | ||||||||||||
Yes | 13 | 3.80% | 29 | 4.37% | 0.185 | 0.402 | 11 | 3.55% | 11 | 3.55% | 0 | 1 |
No | 329 | 96.20% | 634 | 95.63% | Ā | Ā | 299 | 96.45% | 299 | 96.45% | Ā | Ā |
Renal failure | ||||||||||||
Yes | 6 | 1.75% | 0 | 0.00% | 11.701 | 0.002 | 0 | 0.00% | 0 | 0.00% | * | * |
No | 336 | 98.25% | 663 | 100% | Ā | Ā | 310 | 0.00% | 310 | 0.00% | Ā | Ā |
Use of corticosteroids | ||||||||||||
Yes | 15 | 4.59% | 3 | 0.45% | 19.85 | 0 | 2 | 0.65% | 3 | 0.97% | 0.2 | 0.5 |
No | 327 | 95.61% | 660 | 95.55% | Ā | Ā | 308 | 99.35% | 307 | 99.03% | Ā | Ā |
History of cancer | ||||||||||||
Yes | 3 | 0.88% | 6 | 0.90% | 0.002 | 0.633 | 3 | 0.97% | 4 | 1.29% | 0.144 | 1 |
No | 339 | 99.12% | 657 | 99.10% | Ā | Ā | 307 | 99.03% | 306 | 98.71% | Ā | Ā |
COPD | ||||||||||||
Yes | 4 | 1.17% | 14 | 2.11% | 1.138 | 0.21 | 22 | 7.10% | 26 | 8.39% | 0.36 | 0.65 |
No | 338 | 98.83% | 649 | 97.89% | Ā | Ā | 288 | 92.90% | 284 | 91.61% | Ā | Ā |