## 3 Results
### Results of Statistical Analyses  
Positive significant correlations were observed for Ostell 0 and Ostell 1 variables, which means that the higher values of the primary stability were accompanied by higher values of stability measured four weeks after implantation. That correlation was evident in both groups. Furthermore, the statistically significant correlation between the older age of the patient and lower primary and secondary stability values in groups one and two was found. A negative statistical correlation for all implants between Ostell 1 and Ostell 0, as well as between MBL and Ostell 0/Ostell 1 values was found (Tables 2-5). Additionally, no significant differences between groups with 3.5 and 4.0 mm implants were observed regarding primary (Ostell 0) and secondary (Ostell 1) stability, as well as MBL values (Table 6). \begin{table}
\begin{tabular}{c c c c c c c c c c c} \hline \hline
**Group** & **Variable** & **M** & **Me** & **SD** & **Sk.** & **Kurt.** & **Min.** & **Max.** & **W** & **P** \\ \hline \multirow{4}{*}{Group 1 and 2 combined} & Age & 41.55 & 40.00 & 8.85 & 1.30 & 2.49 & 26.00 & 68.00 & 0.87 & 0.01 \\  & Ostell 0 & 71.59 & 71.00 & 4.04 & 0.30 & 0.73 & 62.00 & 82.00 & 0.97 & 0.506 \\  & Ostell 1 & 69.94 & 70.00 & 3.29 & 0.52 & 0.02 & 65.00 & 78.00 & 0.96 & 0.181 \\  & MBL & 0.20 & 0.00 & 0.88 & 1.27 & 0.81 & 0.00 & 1.00 & 0.75 & 0.011 \\ \hline \multirow{4}{*}{1} & Age & 42.95 & 38.00 & 11.30 & 1.06 & 0.71 & 26.00 & 68.00 & 0.83 & 0.016 \\  & Ostell 0 & 70.84 & 70.00 & 3.39 & 0.24 & 0.16 & 65.00 & 78.00 & 0.96 & 0.679 \\  & Ostell 1 & 69.50 & 69.50 & 3.31 & 0.69 & 0.08 & 65.00 & 77.00 & 0.95 & 0.477 \\  & MBL & 0.26 & 0.20 & 0.31 & 1.17 & 0.75 & 0.00 & 1.00 & 0.82 & 0.103 \\ \hline \multirow{4}{*}{2} & Age & 40.15 & 41.00 & 5.38 & \(-\)0.25 & \(-\)0.66 & 31.00 & 50.00 & 0.96 & 0.673 \\  & Ostell 0 & 72.30 & 72.00 & 4.56 & 0.11 & 0.86 & 62.00 & 82.00 & 0.95 & 0.482 \\ \cline{1-1}  & Ostell 1 & 70.39 & 70.00 & 3.29 & 0.44 & 0.54 & 65.00 & 78.00 & 0.95 & 0.492 \\ \cline{1-1}  & MBL & 0.14 & 0.00 & 0.24 & 1.33 & 0.07 & 0.00 & 0.65 & 0.62 & 0.410 \\ \hline \hline \end{tabular} \(M\)—arithmetic mean, _Me_—median, _SD_—standard deviation, _Sk_—skewness, _Kurt._—kurtosis, _Min._—minimum, _Max._—maximum, _W_—Shapiro-Wilk test statistic. The statistically important differences are highlighted in red.  
\end{table} 
Table 1: Descriptive statistics and the normality test to determine distribution for selected variables. Figure 4: Results of the primary (Ostell 0) and secondary (Ostell 1) stability in both groups. Figure 5: Results of marginal bone loss in both groups. \begin{table}
\begin{tabular}{c c c c c c c c c c c} \hline \hline
**Variable** & \multicolumn{3}{c}{**3.5 diameter**} & \multicolumn{3}{c}{**4.0 diameter**} & \multicolumn{3}{c}{\(T\)} & \multicolumn{3}{c}{\(P\)} & \multicolumn{3}{c}{**Cohen’s \(d\)**} \\ \cline{2-10}  & \(M\) & \(SD\) & \(M\) & \(SD\) & & & & \\ \hline MBL & 0.26 & 0.31 & 0.14 & 0.24 & 1.30 & 0.203 & 0.43 \\ Ostell 0 & 70.84 & 3.39 & 72.30 & 4.56 & \(-1.13\) & 0.266 & \(-0.36\) \\ Ostell 1 & 69.50 & 3.31 & 70.39 & 3.29 & \(-0.81\) & 0.425 & \(-0.27\) \\ Age & 42.95 & 11.30 & 40.15 & 5.38 & 1.00 & 0.326 & 0.32 \\ \hline \hline \end{tabular}
\end{table} 
Table 6: The Student’s t-test results for a grouping variable (diameter) and selected dependent variables. \begin{table}
\begin{tabular}{c c c c c} \hline \hline
**Variable** & **Coefficient** & **Age** & **Ostell 0** & **Ostell 1** & **MBL** \\ \hline Age & Pearson’s r & \(1\) & \(-0.24\) & 0.47 & \(-0.37\) \\  & \(P\) & \(<\)0.001 & 0.325 & 0.047 & 0.128 \\ Ostell 0 & Pearson’s r & \(-0.24\) & \(1\) & 0.42 & 0.09 \\ \(P\) & 0.325 & \(<\)0.001 & 0.084 & 0.730 \\ Ostell 1 & Pearson’s r & 0.47 & 0.42 & \(1\) & \(-0.05\) \\ \(P\) & 0.584 & 0.222 & 0.430 & 0.874 \\ MBL & Pearson’s r & \(-0.37\) & 0.09 & \(-0.05\) & 1 \\ \(P\) & 0.128 & 0.730 & 0.837 & \(<\)0.001 \\ \hline \hline \end{tabular}
\end{table} 
Table 4: Linear correlation coefficients for group two and their significance for the selected continuous variables.