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+Data dictionary for Chapter 5, MIMIC Books
+
+ aline_flg: IAC used (binary, 1 = year, 0 = no)
+ icu_los_day: length of stay in ICU (days, numeric)
+ hospital_los_day: length of stay in hospital (days, numeric)
+ age: age at baseline (years, numeric)
+ gender_num: patient gender (1 = male; 0=female)
+ weight_first: first weight, (kg, numeric)
+ bmi: patient BMI, (numeric)
+ sapsi_first: first SAPS I score (numeric)
+ sofa_first: first SOFA score (numeric)
+ service_unit: type of service unit (character: FICU, MICU, SICU)
+ service_num: service as a numeric (binary: 0 =  MICU or FICU, 1 = SICU)
+ day_icu_intime: day of week of ICU admission (character)
+ day_icu_intime_num: day of week of ICU admission (numeric, corresponds with day_icu_intime)
+ hour_icu_intime: hour of ICU admission (numeric, hour of admission using 24hr clock)
+ hosp_exp_flg: death in hospital (binary: 1 = yes, 0 = no)
+ icu_exp_flg: death in ICU (binary: 1 = yes, 0 = no)
+ day_28_flg: death within 28 days (binary: 1 = yes, 0 = no)
+ mort_day_censored: day post ICU admission of censoring or death (days, numeric)
+ censor_flg: censored or death (binary: 0 = death, 1 = censored)
+ sepsis_flg: sepsis present (binary: 0 = no, 1 = yes -- absent (0) for all)
+ chf_flg: Congestive heart failure (binary: 0 = no, 1 = yes)
+ afib_flg: Atrial fibrillation  (binary: 0 = no, 1 = yes)
+ renal_flg: Chronic renal disease (binary: 0 = no, 1 = yes)
+ liver_flg: Liver Disease (binary: 0 = no, 1 = yes)
+ copd_flg: Chronic obstructive pulmonary disease (binary: 0 = no, 1 = yes)
+ cad_flg: Coronary artery disease (binary: 0 = no, 1 = yes)
+ stroke_flg: Stroke (binary: 0 = no, 1 = yes)
+ mal_flg: Malignancy (binary: 0 = no, 1 = yes)
+ resp_flg: Respiratory disease (non-COPD) (binary: 0 = no, 1 = yes)
+ map_1st: Mean arterial pressure (mmHg, numeric)
+ hr_1st: Heart Rate (numeric)
+ temp_1st: Temperature (F, numeric)
+ spo2_1st: S_pO_2 (%, numeric)
+ abg_count: arterial blood gas count (number of tests, numeric)
+ wbc_first: first White blood cell count (K/uL, numeric)
+ hgb_first: first Hemoglobin (g/dL, numeric)
+ platelet_first: first Platelets (K/u, numericL)
+ sodium_first: first Sodium (mEq/L, numeric)
+ potassium_first: first Potassium (mEq/L, numeric)
+ tco2_first: first Bicarbonate (mEq/L, numeric)
+ chloride_first: first Chloride (mEq/L, numeric)
+ bun_first: first Blood urea nitrogen (mg/dL, numeric)
+ creatinine_first: first Creatinine (mg/dL, numeric)
+ po2_first: first PaO_2 (mmHg, numeric)
+ pco2_first: first PaCO_2 (mmHg, numeric)
+ iv_day_1: input fluids by IV on day 1 (mL, numeric)