Table 2.

Data analysis of training set and validation set [n (%), (Mean ± SD)]

Features	Classification	Training set (n = 145)	Validation set (n = 63)	t/χ2	P
Classification
	PI	40 (27.59)	28 (44.44)	5.672	0.017
	NPI	105 (72.41)	35 (55.56)
Male		76 (52.41)	37 (58.73)	0.706	0.401
Age (year)		54.33±6.75	54.28±7.16	0.048	0.562
Smoking history		56 (38.62)	22 (34.92)	0.257	0.613
Drinking history		55 (37.93)	33 (52.38)	3.757	0.053
Diabetes		54 (37.24)	32 (50.79)	3.326	0.068
Hypertension		70 (48.28)	29 (46.03)	0.089	0.766
Osteoarthrosis		67 (46.21)	30 (47.62)	0.035	0.851
Periodic periodontal treatment		50 (34.48)	25 (39.68)	0.515	0.473
Alveolar bone resorption degree	Level 1	51 (35.17)	20 (31.75)	0.835	0.659
	Level 2	46 (31.73)	18 (28.57)
	Level 3	48 (33.10)	25 (39.68)
Implant system	Ankylos	74 (51.03)	32 (50.79)	0.001	0.975
	Nobel	71 (48.97)	31 (49.21)
Dental implant position	Anterior teeth	42 (28.97)	15 (23.81)	1.877	0.391
	Premolars	53 (36.55)	20 (31.75)
	Molars	50 (34.48)	28 (44.44)
Embedding method	Submersible	81 (55.86)	29 (46.03)	1.703	0.192
	Non-submerged	64 (44.14)	34 (53.97)
Plant diameter	< 3.5 mm	45 (31.03)	19 (30.16)	0.265	0.876
	3.6-5 mm	59 (40.69)	24 (38.09)
	> 5 mm	41 (28.28)	20 (31.75)
Planting length	< 8 mm	42 (28.97)	18 (28.57)	0.133	0.935
	10-13 mm	50 (34.48)	24 (38.09)
	> 13 mm	43 (29.65)	21 (33.34)
Mucosal thickness around the implant < 2 mm	Yes	86 (59.31)	30 (47.62)	2.434	0.119
	No	59 (40.69)	33 (52.38)
Bone augmentation surgery		43 (29.66)	24 (38.09)	1.433	0.231
Loading time	1-3 years	91 (62.76)	33 (52.38)	1.965	0.161
	4-5 years	54 (37.24)	30 (47.62)
Keratinized gingival width	< 2 mm	54 (37.24)	28 (44.44)	0.954	0.329
	≥ 2 mm	91 (62.76)	35 (5.56)
Dental plaque index	0 point	49 (33.79)	18 (28.57)	3.835	0.280
	1 point	33 (22.76)	21 (33.34)
	2 points	28 (19.31)	14 (22.22)
	3 points	35 (24.14)	10 (15.87)