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. 2021 Apr 1;21:173. doi: 10.1186/s12903-021-01529-9

Table 2.

Relationship between average diagnosis and type of prosthesis

FD RD
Average diagnosis 0.757 0.982
Variance 0.438 0.519
Observations 765 332
Pooled variance 0.463
Hypothetical difference 0
Degrees of freedom 1095
t-statistics − 5.034
P(T <  = t) one-way  < 0.001
Critical t-value one-way t-test 1.646
P(T <  = t) two-way  < 0.001
critical t-value two-way t-Test 1.962

The two-sample t test, assuming equal variances showed a significant change in the dependent variable, peri-implant health, by the type of prosthesis (p =  < 0.001)