Prognostic immune nutritional index-based nutritional stratification enhances recovery and survival in gastric cancer: A randomized controlled trial

Table 2 Sleep quality (Pittsburgh Sleep Quality Index scores)

Group	Pre-op PSQI	1 week post-op	1 month post-op	1 year post-op	Improvement	Statistic	P value
Low-risk	10.1 ± 3.2	8.5 ± 3.1	7.0 ± 2.6	6.3 ± 2.4	-3.8 ± 2.1	F = 13.56	0.032
Moderate-risk	11.3 ± 4.0	8.9 ± 3.5	6.7 ± 2.8	5.4 ± 2.1	-5.9 ± 2.5	F = 15.21	0.014
High-risk	12.6 ± 4.3	9.3 ± 3.8	5.6 ± 2.3	4.1 ± 1.8	-8.5 ± 2.71	F = 17.98	< 0.001

¹Indicates statistically significant difference compared to other groups (P < 0.01). P values were adjusted using Bonferroni correction where applicable. Missing data were handled using the linear mixed model.

Lower scores indicate better sleep quality. “Improvement” refers to change from baseline (Δ value).

PSQI: Pittsburgh Sleep Quality Index.