Dry Eye Indexes Estimated by Keratograph 5M of Systemic Lupus Erythematosus Patients without Secondary Sjögren’s Syndrome Correlate with Lupus Activity

Table 3

Correlation analysis between each group of data.

	Age (years)	Duration (years)	TMH (mm)	NIKBUT-first (s)	NIKBUT-average (s)	OSDI (score)	SLEDAI (score)	ANA titer
Age (years)		r = 0.256	r = −0.196	r = −0.263	r = −0.368	r = 0.176	r = 0.251	r = −0.017
	Duration (years)	r = 0.256		r = 0.086	r = 0.169	r = 0.125	r = −0.145	r = 0.006	r = −0.126
TMH (mm)		r = −0.196	r = 0.086		r = 0.033	r = 0.174	r = −0.003	r = −0.233	r = 0.052
	NIKBUT-first (s)	r = −0.263	r = 0.169	r = 0.033		r = 0.870	r = −0.241	r = −0.254	r = −0.051
NIKBUT-average (s)		r = −0.368	r = 0.125	r = 0.174	r = 0.870		r = −0.341	r = −0.343	r = −0.103
	OSDI (score)	r = 0.176	r = −0.145	r = −0.003	r = −0.241	r = −0.341		r = 0.256	r = 0.288
SLEDAI (score)		r = 0.251	r = 0.006	r = −0.233	r = −0.254	r = −0.343	r = 0.256		r = 0.290
	ANA titer	r = −0.017	r = −0.126	r = −0.052	r = −0.051	r = −0.103	r = 0.288	r = 0.290

TMH = tear meniscus height. NIKBUT = noninvasive Keratograph tear breakup time. OSDI = Ocular Surface Disease Index. SLEDAI = Systemic Lupus Erythematosus Disease Activity Index. ANA = antinuclear antibody.