Table 1.

Patients' main characteristics according to infliximab levels.

Characteristics	TL < 3 μg/mL		TL ≥ 3 μg/mL		p value
	n	%	n	%
Age
≤40 years	29	61.7	18	38.3	0.803
>40 years	14	58.3	10	41.7
Gender
Male	23	53.5	20	46.5	0.146
Female	20	71.4	8	28.6
Ethnicity
White	36	57.1	27	42.9	0.135
Non-white	7	87.5	1	12.5
Education
Low	11	57.9	8	42.1	0.790
High	32	61.5	20	38.5
Occupation
Unemployed	17	73.9	6	26.1	0.128
Employed	26	54.2	22	45.8
Condition
Crohn's disease	35	64.8	19	35.2	0.257
Ulcerative colitis	8	47.1	9	52.9
IFX duration
≤2 years	20	57.1	15	42.9	0.631
>2 years	23	63.9	13	36.1
Azathioprine
No	26	57.8	19	42.2	0.618
Yes	17	65.4	9	34.6
Smoking
No	41	59.4	28	40.6	0.515
Yes	2	100	0	0