The present study was conducted in the lobbies of 16 Taiwanese urban hospitals to establish what contributes to the degree of noisiness experienced by patients and those accompanying them. Noise level measurements were then conducted by 15 min equivalent sound pressure levels (LAeq, 15m, dB) during daytime hours. The average LAeq itself was found to be poorly related to perceived noisiness. Levels variation were better correlated, more continual noise may actually be perceived as noisier. According to the correlation (r = 0.91, R2 = 0.83) between objective and subjective measures, 1/ (L5 – L95) shown to have the largest effects on perceived noisiness. These results resemble previous studies that had assumed that a larger fluctuation of noise level corresponds to less annoyance experienced for mixed traffic noise. As an advanced approach, for hospital noise that consisted of 12 audible noise events, subjective noisiness were evaluated by autocorrelation of measured noise with loudness and levels variation. And those with shorter reverberation times showed lower noisiness levels which deduced better speech intelligibility in such spaces.