Table 3. Planned contrasts (P) and post hoc comparisons involving the 5 selected types of smiles.

Muscle	Comparison	Mean1(SD)	Mean2(SD)	t-value	p-value
Corrugator	(P) Mixed vs. all other smiles	103.7 (21.4)	97.6 (9.2)	1.9	.067
	Mixed vs. Strongest	103.7 (21.4)	93.7 (10.4)	2.95	.006**
	Mixed vs. Strongest_No_AU6	103.7 (21.4)	94.4 (10.7)	2.53	.017*
	Mixed vs. Weakest	103.7 (21.4)	101 (12.9)	.72	.477
	Mixed vs. Weakest_With_AU6	103.7 (21.4)	101.2 (10.8)	.87	.388
Orbic. Oculi	(P) Strongest & Weakest_With_AU6 vs. Weakest & Strongest_No_AU6 & Mixed	108.6 (12.6)	101.1 (8.3)	3.36	.002**
	Strongest vs. Strongest_No_AU6	110.7 (15.4)	102.2 (12.4)	2.60	.014*
	Strongest vs. Weakest	110.7 (15.4)	100 (8)	3.63	.001**
	Strongest vs. Mixed	110.7 (15.4)	101.2 (9.7)	3.30	.002*
	Weakest_With_AU6 vs. Strongest_No_AU6	106.6 (19.3)	102.2 (12.4)	1.24	.223
	Weakest_With_AU6 vs. Weakest	106.6 (19.3)	100 (8)	1.93	.063
	Weakest_With_AU6 vs. Mixed	106.6 (19.3)	101.2 (9.7)	1.48	.150
Zygomaticus	(P) Strongest & Strongest_No_AU6 vs. Weakest & Weakest_With_AU6 & Mixed	115.7 (25.2)	105.1 (12.3)	2.56	.016*
	Strongest vs. Weakest	117.1 (34.1)	101 (7.6)	2.67	.012*
	Strongest vs. Weakest_With_AU6	117.1 (34.1)	110.3 (22.9)	1.07	.294
	Strongest vs. Mixed	117.1 (34.1)	103.8 (13.7)	2.29	.029*
	Strongest_No_AU6 vs. Weakest	114.3 (37)	101 (7.6)	2.05	.049*
	Strongest_No_AU6 vs. Weakest_With_AU6	114.3 (37)	110.3 (22.9)	.52	.608
	Strongest_No_AU6 vs. Mixed	114.3 (37)	103.8 (13.7)	1.78	.087
Masseter	(P) Strongest & Strongest_No_AU6 vs. Weakest & Weakest_With_AU6 & Mixed	105.5 (12.5)	104.1 (12.7)	.55	.583
	Strongest vs. Weakest	106.2 (20.5)	100.2 (5.2)	1.71	.098
	Strongest vs. Weakest_With_AU6	106.2 (20.5)	107.3 (30.8)	-.2	.844
	Strongest vs. Mixed	106.2 (20.5)	104.8 (13.9)	.41	.682
	Strongest_No_AU6 vs. Weakest	104.7 (10.7)	100.2 (5.2)	2.15	.040*
	Strongest_No_AU6 vs. Weakest_No_AU6	104.7 (10.7)	107.3 (30.8)	-.43	.671
	Strongest_No_AU6 vs. Mixed	104.7 (10.7)	104.8 (13.9)	-.03	.975

Notes:*p<.05.

**p<.01.

***p<.001.