Masticatory Ability for a Single Implant Mandibular Overdenture Retained by Two Different Attachments: A Randomized Controlled Trial

Table 2

Number of patients after randomization into the ball attachment group.

	Dropouts	Number of patients		Total number of patients
		M	F
Number (beginning of randomization)		21	13	34
Patients who did not attend 2 weeks after pickup	1 patient died (M)	20	13	33
Patients who did not attend 3-month follow-up	2 patients dropped out (1 M; 1 F)	19	12	31
Patients who did not attend 6-month follow-up	1 patient died (M)	18	12	30
Patients who did not attend 9-month follow-up	2 patients dropped out (1 M; 1 F)	17	11	28
Patients who did not attend 12-month follow-up	No dropouts	17	11	28
Patients who did not attend 24-month follow-up	1 patient was out of town (M)	16	11	27

M: male, F: female.