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Table 1 Patient demographics

From: Single-crown restorations supported by short implants (6 mm) compared with standard-length implants (13 mm) in conjunction with maxillary sinus floor augmentation: a randomized, controlled clinical trial

Parameter   Groups p value
Patients Short implants Standard-length implants and maxillary sinus floor augmentation
Gender, n 37 20 17 0.74
Males 15 9 6  
Females 22 11  17  
Age, n     1.00
 20–35 years 5 3 2  
 36–50 years 15 8 7  
 51–65 years 14 7 7  
 66–81 years 3 2 1  
Smoking habits, n     1.00
 Non-smokers 36 19 17  
 Smokers 1 1 0  
Mean residual bone height (mm, range) 6.3 mm (5.5–7.0) 6.3 mm (5.5–7.0) 6.3 mm (5.5–7.0) 0.91
Implant position, n     0.63
 First premolar 6 3 3  
 Second premolar 15 9 6  
 First molar 22 10 12  
 Second molar 2 2 0  
History of periodontal disease, n     1.00
 No history 32 17 15  
 History 5 3 2  
Distribution of implants, n     1.00
 Single implant 30 16 14  
 Multiple 7 4 3  
Presence of posterior tooth/teeth     0.61
 None 4 3 1  
 Presence 33 17 16  
Crown-to-implant ratio (mm, range)
 First premolar 1.39 (0.90–1.92) 1.87 (1.83–1.92) 0.90 (0.90–0.92) 0.0495
 Second premolar 1.48 (0.86–2.00) 1.88 (1.70–2.00) 0.88 (0.86–0.88) 0.00
 First molar 1.29 (0.83–1.91) 1.81 (1.70–1.91) 0.86 (0.83–0.90) 0.00
 Second molar 1.80 (1.77–1.83) 1.81 (1.70–1.91) - (.-.)