Table 1.

– Average power spectrum density levels (RMS, dB re 1 μPa².Hz⁻¹) calculated as the mean of all frequency bins below 1000 Hz for each 3h-period during and after lockdown (values are mean ± S.D). Effect sizes are calculated as the median differences between levels recorded after and during the lockdown.

	02:00–05:00	05:00–08:00	08:00–11:00	11:00–14:00	14:00–17:00	17:00–20:00	20:00–23:00	23:00–02:00
During	78.4 ± 3.5	78.5 ± 3.1	78.9 ± 2.2	78.3 ± 2.2	78.2 ± 2.2	79.2 ± 2.3	78.9 ± 3.5	78.5 ± 3.2
After	78.2 ± 3.4	81.8 ± 2.4	84.3 ± 3.0	83.7 ± 3.7	82.2 ± 3.8	85.2 ± 3.6	80.8 ± 3.0	77.5 ± 3.7
Effect size	−0.7	2.7	5.2	5.1	3.6	6.0	1.4	−1.3
95 % CI	−3.9–3.0	0.1–5.9	3.1–7.1	3.7–6.7	2.3–5.2	3.9–7.9	−1.4–5.2	−4.5–2.4