Table 1.

Demographic information on the case series cohort

	London (n=56)	Birmingham (n=35)	Manchester (n=28)	Total (n=119)
Age at presentation, years	22 (14–37)	22 (16–39)	22.5 (17–32)	22 (14–39)
Sex
Male	37 (66.1%)	29 (82.9%)	23 (82.1%)	89 (74.8%)
Female	19 (33.9%)	6 (17.1%)	5 (17.9%)	30 (25.2%)
Ethnicity
Black	3 (5.4%)	3 (8.6%)	3 (10.7%)	9 (7.6%)
Asian or Asian British	41 (73.2%)	19 (54.3%)	8 (28.6%)	68 (57.1%)
White	6 (10.7%)	12 (34.3%)	5 (17.9%)	23 (19.3%)
Other including mixed	4 (7.1%)	1 (2.8%)	2 (7.1%)	7 (5.9%)
Unknown	2 (3.6%)	0 (0.0%)	10 (35.7%)	12 (10.1%)
Documented smoker
Yes	38 (67.9%)	13 (37.1%)	7 (25.0%)	58 (48.7%)
No	18 (32.1%)	22 (62.9%)	21 (75.0%)	61 (51.3%)
Documented alcohol consumption
Yes	30 (53.6%)	8 (22.9%)	5 (17.9%)	43 (36.1%)
No	26 (46.4%)	27 (77.1%)	23 (82.1%)	76 (63.9%)
Excessive consumption	10 (17.9%)	3 (8.6%)	0 (0.0%)	13 (10.9%)
Other recreational drugs documented
Yes	21 (37.5%)	8 (22.9%)	8 (28.6%)	37 (31.1%)
No	35 (62.5%)	27 (77.1%)	20 (71.4%)	82 (68.9%)
Documented employment or education
Yes	26 (46.4%)	15 (42.9%)	8 (28.6%)	49 (41.2%)
No	30 (53.6%)	20 (57.1%)	20 (71.4%)	70 (58.8%)
Documented admission as an inpatient
Yes	20 (35.7%)	32 (91.4%)	18 (64.3%)	70 (58.8%)
No	36 (64.3%)	3 (8.6%)	10 (35.7%)	49 (41.2%)
B12 before presentation
Documented	8 (14.3%)	0 (0.0%)	5 (82.1%)	13 (10.9%)
Not documented	48 (85.7%)	35 (100.0%)	23 (17.9%)	106 (89.1%)

119 patients were included in the case series. The information documented and not documented in electronic records is described. Where relevant, percentages of that value of the total for that column are given in parentheses. Median age and total age range are indicated, as the cohort demonstrated skew on this parameter.