Table 1.

Baseline characteristics of the study population and univariate comparison between the P-UGHR and no P-UGHR groups.

Characteristics	All, n (%) N = 4961		P-UGHR group, n (%) N = 15		No P-UGHR group, n (%) N = 4946		P value	90% confidence interval
Sex
Male	3258	65.7%	8	53.3%	3250	65.7%	0.313
Female	1703	34.3%	7	46.7%	1696	34.3%
Age (month)
Median	20		7		20
Average	24.902		8.733		24.951		<0.001	24.51–25.37
≤10.5	1172	23.6%	11	73.3%	1161	23.5%
>10.5	3789	76.4%	4	26.7%	3785	76.5%
Symptoms
Abdominal pain	4551	91.7%	11	73.3%	4540	91.8%	0.034
Vomiting	2876	58.0%	14	93.3%	2862	57.9%	0.005
Bloody stools	1311	26.4%	12	80.0%	1299	26.3%	<0.001
Diarrhoea	404	8.1%	2	13.3%	402	8.1%	0.792
Fever	730	14.7%	5	33.3%	725	14.7%	0.094
Symptom duration (h)
Median	16		16		24
Average	26.18		34.73		26.21		0.01	25.43–26.94
≤17.5	2581	52.0%	2	13.3%	2579	52.1%
>17.5	2380	48.0%	13	86.7%	2367	47.9%
Number of attempts
1	4434	89.4%	11	73.3%	4423	89.4%	0.067
≥2	527	10.6%	4	26.7%	523	10.6%