Table 1.

Distribution of mMNSI total score and DPNP^a rate by DSPN stage^b.

	Total	No DSPN	Minimal DSPN	Subclinical DSPN	DSPN
Patient no.	145	64	19	18	44
mMNSI, mean ± SD total score	2.7 ± 0.7	1 ± 1	4 ± 0∗∗∗	2 ± 1	5 ± 1∗∗∗
DPNP, n (%)	16 (11.0)	5 (7.8)	0 (0.0)	1 (5.6)	10 (22.7)∗

Abbreviations: mMNSI: modified Michigan Neuropathy Screening Instrument; DSPN: distal symmetrical polyneuropathy; DPNP: diabetic peripheral neuropathic pain; NCS: nerve conduction studies; DN4: Douleur Neuropathique; SD: standard deviations. ^aDPNP indicates patients with DN4≧4. ^bNo DSPN, patients with mMNSI total score < 2.5 and NCS severity score 0-1; minimal DSPN, patients with mMNSI total score≧2.5 and NCS severity score 0-1; subclinical DSPN, patients with mMNSI total score < 2.5 and NCS severity score≧2; DSPN, patients with mMNSI total score≧2.5 and NCS severity score≧2. Data were compared by DSPN stage against no DSPN, using the two-sample t-test for the mMNSI total score and the chi-squared test for the DPNP rate. ^∗p < 0.05, ^∗∗p < 0.01, and ^∗∗∗p < 0.0001 indicate significant difference as compared with no DSPN.