| Name | Type | Nullable | Default value | Comment |
|---|
| CASE_ID | VARCHAR2(6) | N | | The MIMIC-II Case ID (in the waveform database) of the record. |
| RECORD_NAME | VARCHAR2(8) | N | | The name of the WFDB record (within the directory named by the Case ID). |
| SEGMENT_NUM | NUMBER(38) | N | | The sequentially (chronologically) ordered number of the segment within the WFDB record. |
| SIGNAL_NUM | NUMBER(38) | N | | The index of the signal within the segment. |
| DESCRIPTION | VARCHAR2(4000) | Y | | A short description of the type of the signal. |
| GAIN | NUMBER(38) | Y | | The gain of the signal, within the segment. |
| UNITS | VARCHAR2(10) | Y | | The physical dimensions of the values in the signal and segment. |
| INITIAL_VALUE | NUMBER(10) | Y | | The first sample value of the signal, in the segment, in non-physical units (i.e. as an integer-encoded number). |
| STORAGE_FORMAT | NUMBER(2) | Y | | The WFDB storage format of the signal and segment. |
| BLOCK_SIZE | NUMBER(5) | Y | | Currently unused. |
| ADC_RESOLUTION | NUMBER(3) | Y | | The resolution of the A/D conversion of the signal, for the segment, in number of bits. |
| ADC_ZERO | NUMBER(5) | Y | | The value produced by the A/D conversion given a 0-volt input, for the signal and segment. |
| BASELINE | NUMBER(38) | Y | | The sample value corresponding to a baseline level, for the signal and segment. |
| CHECKSUM | NUMBER(6) | Y | | The checksum for the signal and segment. |
| SUBJECT_ID | NUMBER(7) | Y | | The MIMIC-II Subject ID (in the clinical database) of the patient from whom the record was recorded. |
