Table 3 |
||||
|
Balance of the propensity scores for MPE exposure: Results from PSM |
||||
|
Stratum |
Non-Exposed to MPE (A) N |
Exposed to MPE (B) N |
Total |
Net Difference (B-A) Using "Atts" Command |
|
|
||||
|
1 (range of pscore = 0 - ~0.1)# |
221 |
0 |
221 |
|
|
2 (range of pscore = 0.1 - ~0.2)# |
39 |
6 |
45 |
|
|
3 (range of pscore = 0.2 - ~0.3)# |
7 |
4 |
11 |
|
|
4 (range of pscore = 0.3 - ~0.4)# |
19 |
26 |
45 |
18.6% (p < 0.05) |
|
5 (range of pscore = 0.4 - ~0.5)# |
7 |
20 |
27 |
|
|
6 (range of pscore = 0.5 - ~1)# |
5 |
67 |
72 |
|
|
|
||||
|
Total |
298 |
123 |
421 |
|
|
|
||||
|
Average propensity score = .29; SD = .36; Range = .002 - .999 # pscore statistics indicate that there is no statistical difference between A and B within each stratum (p > .05), meaning that propensity scores balanced at 6 strata |
||||
|
Nguyen et al. BMC Medical Education 2011 11:102 doi:10.1186/1472-6920-11-102 |
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