Are you referring to this table
No. Look up pin input threshold (or hysteresis) for typical values.
Figure 29.3.9 in Rev. 8161D–AVR–10/09 of the ATMega48PA-88PA-168PA-328P data sheet.
"I/O Pin Input Hysteresis vs. VCC" and "I/O Pin Input Threshold Voltage vs. VCC"