Table 3.
Subgroup analysis results.
| Outcome | Subgroup | Studies | Patients | RR | 95% CI | Heterogeneity | P-value | F/R |
|---|---|---|---|---|---|---|---|---|
| Effective rate | Types of medications (AP vs.CM) | |||||||
| Vitamin B6 + metoclopramide | 1 | 60 | RR = 1.73 | (1.18–2.55) | NR | P = 0.005 | R | |
| Venous metoclopramide | 1 | 90 | RR = 1.56 | (1.21–2.00) | NR | P = 0.001 | R | |
| Sodium lactate ringer's injection | 1 | 60 | RR = 1.42 | (1.01–2.01) | NR | P = 0.046 | R | |
| Effective rate | Sample size (AP vs. placebo) | |||||||
| ≤ 100 | 3 | 158 | RR = 3.57 | (0.06–200.44) | 98.60% | P = 0.536 | R | |
| >100 | 3 | 691 | RR = 1.04 | (0.79–1.37) | 76.80% | P = 0.781 | R | |
| Effective rate | Publication year (AP vs. placebo) | |||||||
| >2010 | 3 | 520 | RR = 1.28 | (0.79–2.06) | 91.00% | P = 0.313 | R | |
| <2010 | 3 | 329 | RR = 1.93 | (0.50–7.40) | 94.40% | P = 0.340 | R | |
| Effective rate | Types of medications (AT vs.CM) | |||||||
| Vitamin B | 1 | 94 | RR = 1.65 | (1.20–2.28) | NR | P = 0.002 | R | |
| Glucose+Vitamin B6+sodium bicarbonate+Phenobarbital | 1 | 100 | RR = 4.40 | (1.81–10.70) | NR | P = 0.001 | R | |
| Ringer's solution+vitamin B+vitamin C | 1 | 36 | RR = 1.13 | (0.90–1.43) | NR | P = 0.297 | R |
RR, risk ratio; F, Fixed effects model; R, Random effects model; CI, confidence interval; NR, not report; AP, acupressure; AT, acupuncture treatment; CM, conventional medicine.