Table 4. Symmetry of tooth agenesis patterns.

	Comparison		Symmetry I (%)	Symmetry II (%)
		No 3rd—Agenesis	26.7	46.8
Maxilla	Right vs. left side	3rd—Agenesis	29.0	74.6
		3rd—Control	8.6	60.5
		No 3rd—Agenesis	30.0	43.8
Mandible	Right vs. left side	3rd—Agenesis	29.0	71.0
		3rd—Control	8.9	56.3
		No 3rd—Agenesis	6.9	8.8
Left side	Upper left vs. lower left	3rd—Agenesis	24.1	52.1
		3rd—Control	6.6	41.7
		No 3rd—Agenesis	7.9	9.8
Right side	Upper right vs. lower right	3rd—Agenesis	24.4	56.5
		3rd—Control	8.6	52.0
		No 3rd—Agenesis	6.9	8.71
Crossed q1 vs. q3	Upper right vs. lower left	3rd—Agenesis	22.1	47.2
		3rd—Control	6.6	37.7
		No 3rd—Agenesis	7.6	9.5
Crossed q2 vs. q4	Upper left vs. lower right	3rd—Agenesis	24.4	54.8
		3rd—Control	6.6	39.2

Note:

Symmetry I: percentage relative to the whole sample (n = 303) without considering the patterns of no missing teeth as symmetrical. Symmetry II: percentage relative to subsample of subjects with missing teeth in the respective area (i.e., maxilla, mandible etc.).