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Table 1 Estimated numbers of required subjects for 2, 3, 4 and 5 observations with ICC = 0.1

From: Sample size determination for mediation analysis of longitudinal data

Observations
  2 3 4 5
Effect sizea Sobel Product Bootstrap Sobel Product Bootstrap Sobel Product Bootstrap Sobel Product Bootstrap
SS 365 299 304 257 215 215 207 163 169 169 136 142
SH 272 235 237 194 172 180 151 140 150 133 126 131
SM 248 226 230 188 188 200 146 144 145 132 126 130
SL 238 248 251 176 176 176 148 147 149 124 126 128
HS 238 201 209 161 138 143 123 104 108 99 83 85
HH 109 88 94 78 65 69 61 50 57 51 42 40
HM 87 77 99 58 55 57 49 42 52 42 40 40
HL 74 72 73 57 51 25 47 46 20 40 38 39
MS 215 200 209 138 134 140 110 102 105 86 83 85
MH 79 65 69 54 46 46 42 35 36 35 29 31
MM 51 41 44 38 30 33 29 23 28 24 21 23
ML 40 36 38 29 27 28 24 22 25 20 18 20
LS 204 206 204 139 132 140 105 101 103 83 82 82
LH 65 60 69 44 41 40 34 31 32 28 24 24
LM 36 31 33 25 22 24 19 17 18 17 15 15
LL 24 20 22 17 16 15 14 13 12 12 11 11
  1. aEffect size: The first letter is the size of β a , the second letter is the size of β b ; S is small (0.14), M is medium (0.39), L is large (0.59) and H is halfway (0.26) between large and medium effect sizes
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