Laser-Assisted Orthodontic Tooth Movement in Saudi Population: A Prospective Clinical Intervention of Low-Level Laser Therapy in the 1st Week of Pain Perception in Four Treatment Modalities

Table 3

Continuous step-by-step comparison between 2 groups using Mann–Whitney U test.

Groups	Mean rank	Sum of ranks	Mann–Whitney U	Wilcoxon W	value
LLLT + SL vs. NLLLT + SL
After 4 hours
LLLT + SL	6.50	52.00	16.00	52.00	0.092
NLLLT + SL	10.50	84.00
After 24 hours
LLLT + SL	5.50	44.00	8.00	44.00	0.011
NLLLT + SL	11.50	92.00
After 3 days
LLLT + SL	5.56	44.50	8.50	44.50	0.013
NLLLT + SL	11.44	91.50
After 7 days
LLLT + SL	4.69	37.50	1.50	37.50	0.001
NLLLT + SL	12.31	98.50
LLLT + SL vs. LLLT + Conv.
After 4 hours
LLLT + SL	7.63	61	25.00	61.00	0.462
LLLT + Conv.	9.38	75
After 24 hours
LLLT + SL	7.81	62.5	26.50	62.50	0.563
LLLT + Conv.	9.19	73.5
After 3 days
LLLT + SL	5.75	46	10.00	46.00	0.021
LLLT + Conv.	11.25	90
After 7 days
LLLT + SL	4.75	38	2.00	38.00	0.002
LLLT + Conv.	12.25	98
LLLT + SL vs. NLLLT + Conv.
After 4 hours
LLLT + SL	6.06	48.5	12.50	48.50	0.040
NLLLT + Conv.	10.94	87.5
After 24 hours
LLLT + SL	5.25	42	6.00	42.00	0.006
NLLLT + Conv.	11.75	94
After 3 days
LLLT + SL	4.88	39	3.00	39.00	0.002
NLLLT + Conv.	12.13	97
After 7 days
LLLT + SL	4.5	36	0.00	36.00	0.001
NLLLT + Conv.	12.5	100
NLLLT + SL vs. LLLT + Conv.
After 4 hours
NLLLT + SL	9.44	75.5	24.50	60.50	0.429
LLLT + Conv.	7.56	60.5
After 24 hours
NLLLT + SL	11.19	89.5	10.50	46.50	0.024
LLLT + Conv.	5.81	46.5
After 3 days
NLLLT + SL	8.69	69.5	30.50	66.50	0.874
LLLT + Conv.	8.31	66.5
After 7 days
NLLLT + SL	7.5	60	24.00	60.00	0.398
LLLT + Conv.	9.5	76
NLLLT + SL vs. NLLLT + Conv.
After 4 hours
NLLLT + SL	7.38	59	23.00	59.00	0.342
NLLLT + Conv.	9.63	77
After 24 hours
NLLLT + SL	8.56	68.5	31.50	67.50	0.958
NLLLT + Conv.	8.44	67.5
After 3 days
NLLLT + SL	5.56	44.5	8.50	44.50	0.013
NLLLT + Conv.	11.44	91.5
After 7 day
NLLLT + SL	7.13	57	21.00	57.00	0.245
NLLLT + Conv.	9.88	79
LLLT + Conv. vs. NLLLT + Conv.
After 4 hours
LLLT + Conv.	6.44	51.5	15.50	51.50	0.083
NLLLT + Conv.	10.56	84.5
After 24 hours
LLLT + Conv.	5.94	47.5	11.50	47.50	0.031
NLLLT + Conv.	11.06	88.5
After 3 days
LLLT + Conv.	6.31	50.5	14.50	50.50	0.066
NLLLT + Conv.	10.69	85.5
After 7 days
LLLT + Conv.	7.81	62.5	26.50	62.50	0.563
NLLLT + Conv.	9.19	73.5