Table 1.
Outcomes | Analysis 1 | Analysis 2 | Analysis 3 | Analysis 4 | ||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
Studies | Participants | r (95% CI) | Studies | Participants | r (95% CI) | Studies | Participants | r (95% CI) | Studies | Participants | r (95% CI) | |
Attention | 9 | 5,198 | −0.174 (−0.313, −0.027)* | 7 | 5,041 | 0.006 (−0.051, 0.063) | 5 | 4,335 | 0.031 (−0.009, 0.071) | 4 | 4,279 | 0.034 (−0.012, 0.079) |
Executive Function | 13 | 10,070 | −0.051 (−0.118, 0.017) | 11 | 9,913 | −0.006 (−0.061, 0.050) | 9 | 9,207 | 0.017 (−0.043, 0.076) | 8 | 9,151 | 0.003 (−0.054, 0.059) |
Global cognitive function | 6 | 1,999 | −0.122 (−0.218, −0.024)* | 6 | 1,999 | −0.122 (−0.218, −0.024)* | 4 | 1,293 | −0.113 (−0.255, 0.034) | 3 | 1,127 | −0.055 (−0.143, 0.033) |
Memory | 14 | 12,328 | −0.061 (−0.101, −0.020)* | 12 | 12,171 | −0.034 (−0.063, −0.004)* | 10 | 11,465 | −0.022 (−0.041, −0.003)* | 9 | 11,409 | −0.022 (−0.042, −0.001)* |
Processing speed | 13 | 8,775 | −0.119 (−0.190, −0.047)* | 11 | 8,618 | −0.056 (−0.094, −0.017)* | 10 | 8,476 | −0.048 (−0.081, −0.016)* | 9 | 8,420 | −0.048 (−0.082, −0.014)* |
Visuospatial ability | 5 | 1,280 | −0.085 (−0.300, 0.140) | 5 | 1,280 | −0.085 (−0.300, 0.140) | 4 | 1,138 | −0.073 (−0.328, 0.192) | 4 | 1,138 | −0.073 (−0.328, 0.192) |
Analysis 1 included all the eligible studies; Analysis 2 excluded studies with participant of chronic kidney disease based on analysis 1; Analysis 3 further excluded studies with participants of hypertension based on analysis 2; Analysis 4 further excluded studies with participants complaining loss of memory based on analysis 3 and just included studies with participants from general older adults.
P < 0.05.