{
  "research_use_only": true,
  "importance_type": "xgboost_gain",
  "important_note": "Gain weights are explanatory importances, not linear coefficients and cannot be multiplied by raw laboratory values to reproduce XGBoost predictions.",
  "dataset": "ap_multiml_sanitized.csv",
  "target": "Diagnostic Result",
  "raw_value_representing_SAP": 0,
  "normalized_target": "0=non-SAP, 1=SAP",
  "n_total": 1289,
  "n_development": 1031,
  "n_held_out_not_used_for_weights": 258,
  "development_SAP_rate": 0.15809893307468478,
  "scale_pos_weight": 5.325153374233129,
  "model_parameters": {
    "objective": "binary:logistic",
    "base_score": null,
    "booster": null,
    "callbacks": null,
    "colsample_bylevel": null,
    "colsample_bynode": null,
    "colsample_bytree": 0.8,
    "device": null,
    "early_stopping_rounds": null,
    "enable_categorical": false,
    "eval_metric": "aucpr",
    "feature_types": null,
    "feature_weights": null,
    "gamma": 0.1,
    "grow_policy": null,
    "importance_type": null,
    "interaction_constraints": null,
    "learning_rate": 0.05,
    "max_bin": null,
    "max_cat_threshold": null,
    "max_cat_to_onehot": null,
    "max_delta_step": null,
    "max_depth": 3,
    "max_leaves": null,
    "min_child_weight": 3,
    "missing": NaN,
    "monotone_constraints": null,
    "multi_strategy": null,
    "n_estimators": 350,
    "n_jobs": 2,
    "num_parallel_tree": null,
    "random_state": 42,
    "reg_alpha": 0.1,
    "reg_lambda": 2.0,
    "sampling_method": null,
    "scale_pos_weight": 5.325153374233129,
    "subsample": 0.8,
    "tree_method": "hist",
    "validate_parameters": null,
    "verbosity": 0
  },
  "features": [
    {
      "feature": "Ca",
      "gain": 37.11497497558594,
      "gain_weight": 0.07209971975374978,
      "gain_percent": 7.209971975374978,
      "split_count": 59.0
    },
    {
      "feature": "α-HBDH",
      "gain": 23.641277313232422,
      "gain_weight": 0.04592565319055104,
      "gain_percent": 4.592565319055104,
      "split_count": 76.0
    },
    {
      "feature": "CRP",
      "gain": 20.99024200439453,
      "gain_weight": 0.04077573990217518,
      "gain_percent": 4.077573990217518,
      "split_count": 43.0
    },
    {
      "feature": "WBC",
      "gain": 16.8817138671875,
      "gain_weight": 0.03279449439445553,
      "gain_percent": 3.2794494394455533,
      "split_count": 56.0
    },
    {
      "feature": "Neutrophil Percentage ",
      "gain": 16.324705123901367,
      "gain_weight": 0.03171244666795872,
      "gain_percent": 3.171244666795872,
      "split_count": 24.0
    },
    {
      "feature": "Neutrophil Count ",
      "gain": 15.356428146362305,
      "gain_weight": 0.02983146739286837,
      "gain_percent": 2.983146739286837,
      "split_count": 53.0
    },
    {
      "feature": "PT",
      "gain": 13.234396934509277,
      "gain_weight": 0.02570919987729131,
      "gain_percent": 2.5709199877291313,
      "split_count": 34.0
    },
    {
      "feature": "INR",
      "gain": 12.64305305480957,
      "gain_weight": 0.024560452558116515,
      "gain_percent": 2.4560452558116515,
      "split_count": 31.0
    },
    {
      "feature": "LDH",
      "gain": 11.898879051208496,
      "gain_weight": 0.023114816742843644,
      "gain_percent": 2.3114816742843645,
      "split_count": 46.0
    },
    {
      "feature": "Lymphocyte Percentage ",
      "gain": 11.897034645080566,
      "gain_weight": 0.02311123379108298,
      "gain_percent": 2.311123379108298,
      "split_count": 33.0
    },
    {
      "feature": "APTT",
      "gain": 11.286840438842773,
      "gain_weight": 0.0219258677415559,
      "gain_percent": 2.1925867741555902,
      "split_count": 61.0
    },
    {
      "feature": "Hb",
      "gain": 10.999171257019043,
      "gain_weight": 0.021367040276228908,
      "gain_percent": 2.136704027622891,
      "split_count": 40.0
    },
    {
      "feature": "CO₂-CP",
      "gain": 10.168380737304688,
      "gain_weight": 0.0197531428214986,
      "gain_percent": 1.97531428214986,
      "split_count": 56.0
    },
    {
      "feature": "Glu",
      "gain": 9.83408260345459,
      "gain_weight": 0.01910373374118403,
      "gain_percent": 1.9103733741184028,
      "split_count": 61.0
    },
    {
      "feature": "ALB",
      "gain": 9.83022689819336,
      "gain_weight": 0.019096243630548886,
      "gain_percent": 1.9096243630548886,
      "split_count": 52.0
    },
    {
      "feature": "Eosinophil Percentage",
      "gain": 9.202962875366211,
      "gain_weight": 0.017877717677420902,
      "gain_percent": 1.7877717677420901,
      "split_count": 22.0
    },
    {
      "feature": "AMY",
      "gain": 9.131617546081543,
      "gain_weight": 0.017739121915183495,
      "gain_percent": 1.7739121915183496,
      "split_count": 66.0
    },
    {
      "feature": "FIB",
      "gain": 9.102622032165527,
      "gain_weight": 0.017682795097535474,
      "gain_percent": 1.7682795097535473,
      "split_count": 31.0
    },
    {
      "feature": "HCT",
      "gain": 8.935444831848145,
      "gain_weight": 0.01735803590532186,
      "gain_percent": 1.735803590532186,
      "split_count": 40.0
    },
    {
      "feature": "LDL-C",
      "gain": 8.907954216003418,
      "gain_weight": 0.017304632509534405,
      "gain_percent": 1.7304632509534406,
      "split_count": 32.0
    },
    {
      "feature": "MCHC",
      "gain": 8.873711585998535,
      "gain_weight": 0.01723811262022807,
      "gain_percent": 1.723811262022807,
      "split_count": 31.0
    },
    {
      "feature": "MCH",
      "gain": 8.731834411621094,
      "gain_weight": 0.016962501373856593,
      "gain_percent": 1.6962501373856593,
      "split_count": 45.0
    },
    {
      "feature": "MCV",
      "gain": 8.512240409851074,
      "gain_weight": 0.016535917063948326,
      "gain_percent": 1.6535917063948327,
      "split_count": 54.0
    },
    {
      "feature": "IBIL",
      "gain": 8.485943794250488,
      "gain_weight": 0.0164848331384837,
      "gain_percent": 1.64848331384837,
      "split_count": 30.0
    },
    {
      "feature": "Monocyte Percentage",
      "gain": 8.151906967163086,
      "gain_weight": 0.01583593167387876,
      "gain_percent": 1.583593167387876,
      "split_count": 36.0
    },
    {
      "feature": "A/G Ratio",
      "gain": 8.016107559204102,
      "gain_weight": 0.01557212712428635,
      "gain_percent": 1.557212712428635,
      "split_count": 34.0
    },
    {
      "feature": "PCT",
      "gain": 7.924459457397461,
      "gain_weight": 0.015394091103500441,
      "gain_percent": 1.539409110350044,
      "split_count": 39.0
    },
    {
      "feature": "TP",
      "gain": 7.600008964538574,
      "gain_weight": 0.01476381209551298,
      "gain_percent": 1.476381209551298,
      "split_count": 40.0
    },
    {
      "feature": "RBC",
      "gain": 7.532751083374023,
      "gain_weight": 0.014633156628645902,
      "gain_percent": 1.4633156628645902,
      "split_count": 67.0
    },
    {
      "feature": "GLB",
      "gain": 7.471560955047607,
      "gain_weight": 0.014514288406131065,
      "gain_percent": 1.4514288406131064,
      "split_count": 61.0
    },
    {
      "feature": "CK",
      "gain": 7.357662677764893,
      "gain_weight": 0.014293029092931462,
      "gain_percent": 1.4293029092931462,
      "split_count": 48.0
    },
    {
      "feature": "CK-MB",
      "gain": 6.952569961547852,
      "gain_weight": 0.01350609413385507,
      "gain_percent": 1.350609413385507,
      "split_count": 24.0
    },
    {
      "feature": "AST/ALT",
      "gain": 6.912615776062012,
      "gain_weight": 0.013428478950807978,
      "gain_percent": 1.3428478950807978,
      "split_count": 40.0
    },
    {
      "feature": "TT",
      "gain": 6.810605525970459,
      "gain_weight": 0.013230313373478372,
      "gain_percent": 1.3230313373478373,
      "split_count": 31.0
    },
    {
      "feature": "RDW-SD",
      "gain": 6.745864391326904,
      "gain_weight": 0.01310454694988761,
      "gain_percent": 1.310454694988761,
      "split_count": 24.0
    },
    {
      "feature": "P-LCR",
      "gain": 6.714158058166504,
      "gain_weight": 0.013042954082405208,
      "gain_percent": 1.304295408240521,
      "split_count": 21.0
    },
    {
      "feature": "TC",
      "gain": 6.504186630249023,
      "gain_weight": 0.012635062628373425,
      "gain_percent": 1.2635062628373426,
      "split_count": 54.0
    },
    {
      "feature": "Cl⁻",
      "gain": 6.499822616577148,
      "gain_weight": 0.012626585075500206,
      "gain_percent": 1.2626585075500205,
      "split_count": 27.0
    },
    {
      "feature": "Urea",
      "gain": 6.452428340911865,
      "gain_weight": 0.01253451673931928,
      "gain_percent": 1.253451673931928,
      "split_count": 31.0
    },
    {
      "feature": "PLT",
      "gain": 6.443802356719971,
      "gain_weight": 0.01251775986306529,
      "gain_percent": 1.251775986306529,
      "split_count": 19.0
    },
    {
      "feature": "TG",
      "gain": 6.410703182220459,
      "gain_weight": 0.0124534612556416,
      "gain_percent": 1.24534612556416,
      "split_count": 31.0
    },
    {
      "feature": "PDW",
      "gain": 6.390880107879639,
      "gain_weight": 0.012414952860968801,
      "gain_percent": 1.2414952860968802,
      "split_count": 38.0
    },
    {
      "feature": "GGT",
      "gain": 6.09046745300293,
      "gain_weight": 0.011831369866737005,
      "gain_percent": 1.1831369866737005,
      "split_count": 51.0
    },
    {
      "feature": "Eosinophil Count",
      "gain": 5.952612400054932,
      "gain_weight": 0.011563572011808448,
      "gain_percent": 1.1563572011808447,
      "split_count": 15.0
    },
    {
      "feature": "Monocyte Count",
      "gain": 5.614561557769775,
      "gain_weight": 0.010906872902963258,
      "gain_percent": 1.0906872902963258,
      "split_count": 37.0
    },
    {
      "feature": "Lymphocyte Count",
      "gain": 5.393311977386475,
      "gain_weight": 0.010477072458485956,
      "gain_percent": 1.0477072458485956,
      "split_count": 36.0
    },
    {
      "feature": "ALP",
      "gain": 5.162437915802002,
      "gain_weight": 0.010028575452908016,
      "gain_percent": 1.0028575452908017,
      "split_count": 17.0
    },
    {
      "feature": "TBIL",
      "gain": 5.133595943450928,
      "gain_weight": 0.009972546905804706,
      "gain_percent": 0.9972546905804706,
      "split_count": 22.0
    },
    {
      "feature": "ALT",
      "gain": 5.048896312713623,
      "gain_weight": 0.009808009016625936,
      "gain_percent": 0.9808009016625936,
      "split_count": 23.0
    },
    {
      "feature": "Na⁺",
      "gain": 5.0020294189453125,
      "gain_weight": 0.009716965174924663,
      "gain_percent": 0.9716965174924662,
      "split_count": 47.0
    },
    {
      "feature": "DBIL",
      "gain": 4.940910816192627,
      "gain_weight": 0.009598235898315745,
      "gain_percent": 0.9598235898315745,
      "split_count": 18.0
    },
    {
      "feature": "MPV",
      "gain": 4.5203399658203125,
      "gain_weight": 0.008781233045198197,
      "gain_percent": 0.8781233045198197,
      "split_count": 14.0
    },
    {
      "feature": "Cr",
      "gain": 4.325992584228516,
      "gain_weight": 0.00840369293485565,
      "gain_percent": 0.840369293485565,
      "split_count": 23.0
    },
    {
      "feature": "K⁺",
      "gain": 4.270098686218262,
      "gain_weight": 0.008295113193521192,
      "gain_percent": 0.8295113193521192,
      "split_count": 39.0
    },
    {
      "feature": "AST",
      "gain": 4.265406131744385,
      "gain_weight": 0.00828599741578678,
      "gain_percent": 0.828599741578678,
      "split_count": 13.0
    },
    {
      "feature": "Basophil Percentage",
      "gain": 3.842034101486206,
      "gain_weight": 0.007463552977840372,
      "gain_percent": 0.7463552977840372,
      "split_count": 7.0
    },
    {
      "feature": "Basophil Count",
      "gain": 3.4520182609558105,
      "gain_weight": 0.006705906426272928,
      "gain_percent": 0.6705906426272927,
      "split_count": 2.0
    },
    {
      "feature": "RDW-CV",
      "gain": 2.880258083343506,
      "gain_weight": 0.0055952024961391155,
      "gain_percent": 0.5595202496139116,
      "split_count": 5.0
    },
    {
      "feature": "Gender",
      "gain": 0.0,
      "gain_weight": 0.0,
      "gain_percent": 0.0,
      "split_count": 0.0
    }
  ]
}