Table 3 Comparison between the right (injection) side and left (no-injection) side in each group regarding nasal symptoms

Group I (coblation group)

 Nasal discomfort

6.95 ± 0.81

8.075 ± 0.76

z =  − 5.5109

 < 0.00001

 Nasal pain

7.025 ± 0.73

8.1 ± 0.67

z =  − 5.5109

 < 0.00001

 Nasal obstruction

5.05 ± 0.78

6.1 ± 0.74

z =  − 5.5109

 < 0.00001

 Thick nasal discharge

7.15 ± 0.74

8.175 ± 0.71

z =  − 5.5109

 < 0.00001

Group II (diathermy group)

 Nasal discomfort

7.275 ± 0.68

8.325 ± 0.65

z =  − 5.5109

 < 0.00001

 Nasal pain

7.4 ± 0.59

8.275 ± 0.68

z =  − 5.1594

 < 0.00001

 Nasal obstruction

5.475 ± 0.55

6.375 ± 0.59

z =  − 5.2316

 < 0.00001

 Thick nasal discharge

7.35 ± 0.62

8.2 ± 0.61

z =  − 5.0862

 < 0.00001