We found no difference in the percentage of INRs in
the therapeutic range between PST or PSM and usual care.The pooled weighted mean was 71% (range of means,
43% to 87%) in the PST or PSM group and 59% (range
of means, 22% to 78%) in the usual care group (11 studies).
The weighted mean difference of 5.9% was not statistically
significant and had a high level of heterogeneity (CI,
0.18% to 12.0%; I2 83%; P 0.057; 6 studies).