A	Area
API	Active pharmaceutical ingredient
AR	Aspect ratio
b0	Constant term of the polynomial model
b1, b2	Linear regression coefficients of x1 (pellet composition) and x2 (osmolarity)
b11, b22	Quadratic regression coefficients of x1 (pellet composition) and x2 (osmolarity)
b12	Interaction coefficient
C	Circularity
d	Diameter
deq	Area-equivalent spherical diameter
ERL	Eudragit® RL30D
ERS	Eudragit® RS30D
F	Force (maximum)
FeSSGF	Fed-state simulated gastric fluid
GPM	Glucopyranosyl mannitol
GPS	Glucopyranosyl sorbitol
MCC	Microcrystalline cellulose
mOsm	Milliosmole
Mt	The percentage of drug dissolved at time t
${\mathrm{M}}_{\infty }$	Maximum release
n	Number of replicates
NSAID	Non-steroidal anti-inflammatory drug
p	Probability value
P	Perimeter
r	Correlation coefficient
R	Roundness
SD	Standard deviation
SEM	Scanning electron microscope
t	Time
t0	lag time
TEC	Triethyl citrate
τd (h)	Time when 63.2% of the drug is dissolved
UV	Ultraviolet
x1	Coded value of the pellet excipient composition
x2	Coded value of the glucose concentration of the dissolution medium
y	Response variable of the polynomial model
β	Shape factor of the Weibull function
σf	Surface tensile strength