Table 2.

Baseline Characteristics

Characteristic	Total Keratoconus Patients	Number of Penetrating Keratoplasty Surgeries (%)	Number of Lamellar Keratoplasty Surgeries (%)
Age
0–20	1365	19 (1.4%)	3 (0.2%)
20–40	10848	290 (2.7%)	39 (0.4%)
40–60	15466	231 (1.5%)	19 (0.1%)
60–80	4749	73 (1.5%)	5 (0.1%)
≥80	309	5 (1.6%)	0 (0.0%)
Gender
Male	18670	386 (2.1%)	42 (0.2%)
Female	14067	232 (1.6%)	24 (0.2%)
Region
Midwest	9072	170 (1.9%)	21 (0.2%)
Northeast	4475	44 (1.0%)	9 (0.2%)
South	12771	255 (2.0%)	27 (0.2%)
West	6419	149 (2.3%)	9 (0.1%)
Race
White	22667	393 (1.7%)	43 (0.2%)
Black	3303	96 (2.9%)	10 (0.3%)
Hispanic/Latino	3157	57 (1.8%)	10 (0.3%)
Other	3610	72 (2.0%)	3 (0.1%)
Education
Bachelor Degree Plus	8717	84 (1.0%)	12 (0.1%)
Less than Bachelor Degree	16502	316 (1.9%)	34 (0.2%)
High School Diploma	6144	178 (2.9%)	17 (0.3%)
Less than 12th Grade	194	4 (2.1%)	0 (0.0%)
Unknown	1180	36 (3.1%)	3 (0.3%)
Household Net Worth
<$25K	2908	94 (3.2%)	13 (0.4%)
$25–149K	2314	56 (2.4%)	8 (0.3%)
$150–249K	8658	141 (1.6%)	15 (0.2%)
$250–499K	2880	49 (1.7%)	6 (0.2%)
$500K+	7880	97 (1.2%)	8 (0.1%)
Unknown	8097	181 (2.2%)	16 (0.2%)
Insurance Type
Medicare	2103	40 (1.9%)	2 (0.1%)
Commercial	30406	569 (1.9%)	63 (0.2%)
Medicaid	228	9 (3.9%)	1 (0.4%)
Comorbid Conditions
Allergic Rhinitis	2407	31 (1.3%)	4 (0.2%)
Asthma	1354	21 (1.6%)	1 (0.1%)
Depression	810	13 (1.6%)	0 (0.0%)
Diabetes	2336	39 (1.7%)	1 (0.0%)
Down Syndrome	59	3 (5.1%)	0 (0.0%)
Hyperlipidemia	5740	78 (1.4%)	6 (0.1%)
Sleep apnea	1099	22 (2.0%)	2 (0.2%)
Cataract	3363	50 (1.5%)	3 (0.1%)
Macular degeneration	287	1 (0.3%)	0 (0.0%)
Primary Open Angle Glaucoma	548	4 (0.7%)	1 (0.2%)
Pseudophakia/aphakia	634	12 (1.9%)	1 (0.2%)