Table 3.

Subgroup analyses of the effect of salviae miltiorrhizae and ligustrazine hydrochloride injection for improving peroneal nerve MCV and SCV.

Subgroup	Median nerve MCV			Median nerve SCV
	Studies	Patient	MD (95% CI)	Studies	Patient	MD (95CI)
Dose
Intravenous infusion 20 ml	2[23,27]	146	3.11 (1.97–4.25)	2[23,27]	146	4.73 (2.33–7.14)
Intravenous infusion 15ml	2[25,32]	160	9.00 (7.28–10.72)	2[25,32]	160	7.21 (5.89–8.54)
Intravenous infusion 10ml	6[24,29–31,35–36]	597	4.86 (3.77–5.96)	6[24,29–31,35–36]	597	4.49 (2.97–6.01)
Acupoint injection 1ml	2[28,37]	160	4.80 (3.05–6.54)	2[28,37]	160	3.95 (2.38 –5.53)
Test for subgroup differences: p < 0.001, I2 = 90.4%				Test for subgroup differences: P = 0.007, I2 = 75.2%
Treatment duration
2 weeks	6[23–25,29,32,34,35]	519	6.61 (4.52–8.70)	6[23–25,29,32,34,35]	519	6.23 (5.27–7.18)
3 weeks	3[27,31,36]	284	3.88 (2.56–5.21)	3[27,31,36]	284	4.46 (3.16–5.76)
4 weeks	1[30]	100	3.70 (1.90–5.50)	1[30]	100	1.90 (0.29–3.51)
8 weeks	2[28,37]	160	4.80 (3.05–6.54)	2[28,37]	160	3.95 (2.38–5.53)
Test for subgroup differences: p = 0.13, I2 = 46.6%				Test for subgroup differences: P < 0.001, I2 = 86.6%
Manufactor
Guizhou Baite	6[23,25,30–32,35]	603	5.95 (3.88–8.03)	6[23,25,30–32,35]	603	4.97 (3.14–6.80)
Jilin Sichang	2[28,36]	190	4.95 (3.40–6.50)	2[28,36]	190	3.77 (2.43–5.11)
Other	4[24,27,29,37]	270	4.70 (2.38–7.02)	4[24,27,29,37]	270	5.36 (4.42–6.31)
Test for subgroup differences: p = 0.68, I2 = 0%				Test for subgroup differences: P = 0.16, I2 = 45.3%