. 2017 Jan 25;31(1):11–18. doi: 10.1016/j.sjopt.2017.01.002

Table 6.

The mean average progression index & Q value and its P values.

	Preoperative Mean ± SD Min-max	3 months Mean ± SD Min-max	P¹ value	6 months Mean ± SD Min-max	P² value	12 months Mean ± SD Min-max	P³ value
Average progression index	1.7 ± 0.5	1.6 ± 0.5^AC	<0.001^*	1.4 ± 0.46^AB	<0.001^*	1.37 ± 0.46^CB	<0.001^*
Average progression index	1.11–2.98	1.0–2.90	<0.001^*	0.9–2.6	<0.001^*	0.9–2.5	<0.001^*
Q value	0.72 ± 0.14	0.75 ± 0.13^AC	0.001^*	0.69 ± 0.13^AB	<0.001^*	0.68 ± 0.13^BC	<0.001^*
Q value	0.5–1.07	0.52–1.07	0.001^*	0.49–0.98	<0.001^*	0.46–0.97	<0.001^*

Paired samples t test. ABC: Similar letters indicate statistically significant differences (p < 0.05).

P1: difference between preoperative and after 3 months.

P2: difference between preoperative and 6 months.

P3: difference between preoperative and 12 months.

SD: Standard deviation.