Table 5.
Relationship between type of surgery (shunting or filtering) and ptosis
| Type of surgery | Ptosis (3 months)
|
Total | |
|---|---|---|---|
| No (%) | Yes (%) | ||
| Shunting* | 61 (89.7) | 7 (10.3) | 68 |
| Filtering** | 69 (77.5) | 20 (22.5) | 89 |
| Total | 130 (82.8) | 27 (17.2) | 157 |
| Chi-square test1 | |||
|
| |||
| Value | df | Asymptotic significance (2-sided) | |
|
| |||
| Pearson chi-square | 4.014a | 1 | 0.045 |
| Continuity correctionb | 3.205 | 1 | 0.073 |
| Likelihood ratio | 4.202 | 1 | 0.040 |
| Linear-by-linear association | 3.989 | 1 | 0.046 |
| N of valid cases | 157 | ||
| Symmetric measures2 | |||
|
| |||
| Value | P<0.05 | ||
|
| |||
| Phi | 0.160 | 0.045 | |
| Cramer’s V | 0.160 | 0.045 | |
| N of valid cases | 157 | ||
Notes:
*
Shunting surgery includes Baerveldt and Ahmed implants.
**
Filtering surgery includes trabeculectomy and Express.
a
0 cells (0.0%) have expected count <5. The minimum expected count is 11.69.
b
Computed only for a 2×2 table.
1
Chi-square test, statistical method assessing the relationship between observed and expected categorical values.
2
Symmetric measures determine strength of relationship between the observed and expected categorical values.