Table 1 National dysphagia diet standard23 and international dysphagia diet standardization initiative (IDDSI)24.

From: Parameter analysis using swallowing sounds shows differences in bolus volume, bolus viscosity, sex, and age

NDD23

IDDSI24

Standardized levels

Viscosity (cP)

Thickness level

Syringe flow test (mL)

Thin liquid

1–50

0 (Thin)

<1.0

  

1 (Slightly thick)

1.0–4.0

Nectar-like

51–350

2 (Mildly thick)

4.0–8.0

Honey-like

351–1750

3(Moderately thick)

>8.0

Spoon-thick

>1750

4(Extremely thick)

10.0

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