Table 1 Clinical characteristics of patients in the training set and validation set

Demographic characteristics

 Age, years (mean ± SD)

71.01 ± 14.54

70.69 ± 14.74

71.77 ± 14.09

-0.677

0.499

 Male, n (%)

233(59.10)

163(59.10)

70(59.30)

0.002

0.961

 BMI, kg/m²(mean ± SD)

21.06 ± 3.55

20.90 ± 3.49

21.44 ± 3.69

-1.375

0.170

Prehospital clinical data

 SBP, mmHg, IQR

132.00(119.75, 150.00)

134.00(118.00, 151.50)

130.00(120.00, 150.00)

-0.486

0.627

 DBP, mmHg, IQR

80.00(68.00, 88.00)

80.00(70.00, 86.00)

79.50(64.75, 88.00)

-0.984

0.325

 Heart rate, bpm, IQR

84.00(71.75, 100.00)

84.50(71.25, 100.00)

83.50(71.75, 100.00)

-0.231

0.817

Past medical history

 Hypertension, n (%)

108(27.40)

77(27.90)

31(26.30)

0.110

0.740

 Diabetes mellitus, n (%)

80(20.30)

56(20.30)

24(20.30)

0.000

0.991

 Atrial fibrillation, n (%)

86(21.80)

61(22.10)

25(21.20)

0.041

0.840

 Coronary heart disease, n (%)

96(24.40)

69(25.00)

27(22.90)

0.201

0.654

 Chronic renal failure, n (%)

73(18.50)

45(16.30)

28(23.70)

3.018

0.082

Prehospital clinical symptoms

 Headache, n (%)

140(35.50)

100(36.20)

40(33.90)

0.197

0.658

 Dizzy, n (%)

186(47.20)

122(44.20)

64(54.20)

3.340

0.068

 Vomiting, n (%)

147(37.30)

100(36.20)

47(39.80)

0.458

0.499

FAST score

 Facial droop, n (%)

170(43.10)

118(42.80)

52(44.10)

0.058

0.809

 Arm weakness, n (%)

174(44.20)

122(44.20)

52(44.10)

0.001

0.980

 Slurred speech, n (%)

155(39.30)

114(41.30)

41(34.70)

1.490

0.222

Duration of symptom, min, IQR

35.00(25.00, 50.00)

35.00(25.00, 50.00)

30.00(25.00, 51.25)

-0.322

0.747

Stroke type

0.773

0.379

 Hemorrhagic stroke

131(33.20)

88(31.90)

43(36.40)

 Ischemic stroke

263(66.80)

188(68.10)

75(63.60)