Table 1:

Baseline demographic and clinical characteristics according to no or poor (Tan 0–1) and moderate or good collaterals (Tan 2–3)

Tan 0–1 (n = 48)Tan 2–3 (n = 56)P Value
Demographic characteristics
    Age (mean) (SD) (yr)72.0 (11.7)73.7 (4.3).52a
Female sex (No.) (%)17 (35.4)23 (41.1).56b
Premedication (No.) (%)
    Antiplatelets.5b
        No33 (71.7)38 (69.1)
        Aspirin12 (26.1)13 (23.6)
        Dual1 (2.2)4 (7.3)
        Missing21
    Oral anticoagulants
        No42 (89.4)36 (65.5).01b
        Missing11
    Statins
        No37 (80.4)30 (56.6).01b
        Missing23
Vascular risk factors (No.) (%)
    Hypertension37 (77.1)37 (66.1).22b
    Diabetes mellitus13 (27.1)10 (17.9).26b
    Hyperlipidemia12 (25.0)17 (30.4).54b
    Smokingc11 (23.4)4 (7.1).02b
    Heart failure10 (20.8)19 (27.9).14b
    Atrial fibrillation24 (50)30 (53.6).72b
    Peripheral artery occlusive diseased1 (2.1)4 (7.4).22b
Pretreatment imaging (No.) (%)
    ASPECTS<.001b
        10–824 (50)47 (83.9)
        7–622 (45.8)7 (12.5)
        <62 (4.2)2 (3.6)
        Median (IQR)7 (6–9)9 (8–10)
    Infarct volume (mean) (SD) (cm3)107.4 (99.1)35.0 (55.1)<.001a
Scores on admission (No.) (%)
    Premorbid mRS.02e
        030 (62.5)24 (42.9)
        111 (22.9)10 (17.9)
        24 (8.3)14 (25)
        >23 (6.3)8 (14.3)
    NIHSS on admission17.9 (3.6)16.9 (3.7).14a
    GCS on admission.8e
        126 (12.5)2 (3.6)
        1321 (43.8)31 (55.4)
        15–1421 (43.8)23 (41.2)
Occlusion (No.) (%)
        MCA26 (54.2)39 (69.6).08b
        ICA3 (6.3)0 (0)
        ICA + MCA19 (39.6)17 (30.4)
    Occlusion side right22 (45.8)23 (44.1).63b
Treatment of stroke.24b
    IV tPA + EST32 (66.7)31 (55.4)
    EST16 (33.3)25 (44.6)

  • Note:—GCS indicates Glasgow Coma Scale; IQR, interquartile range.

  • ↵a t test, 2-sided.

  • ↵b χ2 test, 3-sided.

  • ↵c Lower sample size in Tan group 0–1 (n = 47).

  • ↵d Lower sample size in Tan group 0–1 (n = 47) and Tan group 2–3 (n = 54).

  • ↵e Mann-Whitney U test, 2-sided.