STATISTICS.md

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HEALTHY-BRAIN TRAINING CORPUS — FINAL SNAPSHOT
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Manifest:                     /home/MRI-DataSet/manifest.csv
Golden-0-to-25 (primary):     /home/MRI-DataSet/Golden-0-to-25/
Golden-25plus (fine-tune):    /home/MRI-DataSet/Golden-25plus/

Total scans:                  6351
Labelled healthy:             4592 (72.3%)
With known age:               6268 (98.7%)
  age <  25 (primary):        4782
  age >= 25 (pretrain):       1486
Unknown age (to impute):      83

Age distribution (years) over dated scans:
  min=-0.1  median=15.2  max=86.3
  mean=20.3 ± 17.6

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SPLIT BREAKDOWN
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  0-25                           4782 scans   (healthy=3141)  range=-0.1-25.0
  25+                            1370 scans   (healthy=1370)  range=25.0-86.3
  excluded_patho_over_25          118 scans   (healthy=0)  range=25.0-64.0
  unknown                          81 scans   (healthy=81)  range=n/a

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PER-DATASET BREAKDOWN
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dataset                       scans  healthy  age<25  age>=25         age range
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DataSet-10_ABIDE-I             1102      571     941      161          6.5-64.0
DataSet-11_ABIDE-II            1007      533     901      106          5.1-64.0
DataSet-12_ADHD-200             717      230     717        0          7.2-21.7
DataSet-1_BCP                   566      566     566        0          -0.1-3.0
DataSet-1_BCP_patho             267        0     267        0          -0.1-3.0
DataSet-2_Calgary               266      266     223        0           2.6-6.9
DataSet-3_ds002726               29       29      29        0         10.0-10.0
DataSet-4_ds000248                1        1       0        1         30.0-30.0
DataSet-5_PTBP                  213      213     193        0          7.0-18.0
DataSet-6_IXI                   581      581      42      521         20.0-86.3
DataSet-7_MPI-Leipzig           319      319     105      212         22.5-77.5
DataSet-8_AOMIC-ID1000          951      951     798      153         19.0-26.0
DataSet-9_NKI-Rockland          332      332       0      332         38.0-74.0
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AGE HISTOGRAM (5-year bins, across all dated scans)
  [  0,   5)    985  ###############################
  [  5,  10)    853  ###########################
  [ 10,  15)   1242  ########################################
  [ 15,  20)    536  #################
  [ 20,  25)   1161  #####################################
  [ 25,  30)    418  #############
  [ 30,  35)    136  ####
  [ 35,  40)     86  ##
  [ 40,  45)    108  ###
  [ 45,  50)    111  ###
  [ 50,  55)     98  ###
  [ 55,  60)    133  ####
  [ 60,  65)    132  ####
  [ 65,  70)    129  ####
  [ 70,  75)    112  ###
  [ 75,  80)     15  
  [ 80,  85)      6  
  [ 85,  90)      2  

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TARGET SPLITS FOR TRAINING
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Primary training (0-25 years)   :  4782 scans
Pretraining pool (25+ years)    :  1486 scans
Grand total labelled            :  6268 scans

Strategy (per user):
  1. Train EfficientNet-B3 multi-view on Training_0to25/   (pediatric + young adult)
  2. Ablation: pretrain on Training_0to25 + Pretrain_25plus
     (full lifespan), then fine-tune on 0-25
  3. Compare pediatric MAE between the two strategies in thesis