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. 2018 Mar 9;57(15):2141–2146. doi: 10.2169/internalmedicine.0333-17

Table 2.

Spearman’s Rank Correlation Coefficients between Clinical Variables and Estimated Caffeine Doses or Serum Caffeine Levels.

Estimated caffeine dose (n=93)
Correlation coefficient
p value
RR 0.23 0.03
GCS -0.22 0.04
ALT 0.25 0.02
Glucose 0.30 0.00
K+ -0.41 0.00
Serum caffeine level (n=17)
Correlation coefficient
p value
SBP -0.75 0.00
GCS -0.61 0.02
Glucose 0.59 0.02

RR: respiratory rate, GCS: Glasgow Coma Scale, ALT: alanine aminotransferase, SBP: systolic blood pressure