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Table 3 Subgroup analysis of the included papers for outcome new bone formation (NBF; SMD)

From: Does the incorporation of strontium into calcium phosphate improve bone repair? A meta-analysis

Subgroup

Number of comparisons

Number of defects

Effect estimate SMD [95% CI]

Heterogeneity (I2)

Disease

    

Health

17

202

1.85 [0.95, 2.76]

81%

Osteoporosis

14

243

2.73[1.94, 3.52]

71%

Animal

    

Rat

15

267

2.42 [1.62, 3.22]

79%

Rabbit

7

84

4.32 [1.78, 6.86]

88%

Sheep

7

74

0.85 [− 0.03, 1.72]

52%

Material

    

HA

7

120

2.18 [1.19, 3.17]

74%

β-TCP

2

20

3.48 [1.99, 4.97]

Not applicable

CPC

9

145

1.98 [0.85, 3.12]

83%

CPP

5

60

6.60 [4.09, 9.12]

52%

Period

    

1 m

6

95

1.68 [0.08, 3.29]

86%

2 m

10

116

3.52 [2.35, 4.69]

55%

3 m

2

44

1.10 [− 0.08, 2.29]

74%

4 m

3

46

3.59 [2.54, 4.64]

0%

  1. HA: hydroxyapatite; β-TCP: beta-tricalcium phosphate; CPC: Calcium phosphate cements; CPP: Calcium polyphosphate; m: month