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Table 5 Estimated numbers of required subjects for 2, 3, 4 and 5 observations with ICC = 0.9

From: Sample size determination for mediation analysis of longitudinal data

Observations

 

2

3

4

5

Effect size

Sobel

Product

Bootstrap

Sobel

Product

Bootstrap

Sobel

Product

Bootstrap

Sobel

Product

Bootstrap

SS

638

576

581

544

495

523

499

465

454

476

426

455

SH

551

545

550

499

468

473

462

463

464

458

440

465

SM

551

550

550

507

485

490

476

479

478

444

447

445

SL

568

576

577

512

499

500

461

466

466

447

425

435

HS

308

246

251

236

189

204

193

163

168

175

148

162

HH

195

165

170

159

144

149

144

139

142

143

129

134

HM

183

171

170

143

148

149

139

133

132

134

128

129

HL

167

164

166

154

145

148

134

134

132

134

129

131

MS

232

208

212

171

145

153

136

113

111

115

95

102

MH

109

92

102

90

74

85

79

66

70

71

65

67

MM

86

76

82

73

66

65

65

64

64

63

60

62

ML

82

74

77

70

65

66

63

63

63

65

61

62

LS

213

207

216

144

133

137

111

108

109

91

84

84

LH

77

64

76

56

48

54

49

40

48

43

36

40

LM

50

42

46

41

36

34

35

31

32

32

27

30

LL

41

34

37

33

31

33

31

29

30

30

28

30