Table 4.

Multiple regression* of clinical characteristics on Vitamin D Level in 137 patients with symptoms of gastroparesis but normal gastric emptying

Clinical Characteristic	Comparison	Cumulative Odds Ratio of decreasing Vitamin D level	95% CI	P-value
Age	Per year	0.98	0.95, 1.00	0.04
BMI	Per kg/m2	1.05	1.01, 1.09	0.01
HbA1c	Per %	1.38	1.09, 1.75	0.008
Retching	Per score	1.56	1.25, 1.96	< 0.001
Normogastria at baseline	Per %	0.96	0.94, 0.99	0.006

^*Multiple ordinal logistic regression model using backward stepwise selection (P > 0.05 for removal) regressing Vitamin D level categorization (0 = normal, 1 = insufficient, 2 = deficient) on 39 candidate variables including age, race, sex, ethnicity, summer, BMI, HbA1c, diabetes, GE at 1 h., GE at 2 h., GE at 4 h., nausea, retching, vomiting, stomach fullness, not able to finish meal, feeling excessively full, loss of appetite, bloating, stomach visibly larger and calcium, water load amount, following symptoms at baseline and change from baseline: fullness, hunger, nausea, bloating and abdominal discomfort, following GMA regions at baseline and change from baseline: bradygastria, normogastria, tachygastria, duodenal region