Table 1 For each period, the mean ± standard error of the features that describe the diurnal intake pattern of included growing-finishing pigs, obtained from the generalised additive models (GAMs).

GAM feature	Period 1	Period 2	Period 3	Period 4	Period 5	P-value	ICC
GAM feature	Days 5–18	Days 19–32	Days 33–46	Days 47–60	Days 61–74	P-value	Pen	Pig
Timing of highest intake peak (Hours post-midnight)	16.4 ± 0.2^a	14.6 ± 0.2^b	15.7 ± 0.2^c	16.0 ± 0.2^ac	16.3 ± 0.2^a	< 0.01	0.04	0.39
Highest intake peak (Detrended g/h)	195 ± 5^a	213 ± 5^b	228 ± 4^c	236 ± 5^c	245 ± 9^c	< 0.01	0.02	0.10
Width of highest peak (Detrended g/h)	17 ± 2^a	18 ± 1^ab	21 ± 1^b	23 ± 2^b	24 ± 3^ab	0.01	0.00	0.06
Lowest intake (Detrended g/h)	41 ± 2^a	38 ± 2^ab	35 ± 2^bc	32 ± 2^cd	29 ± 2^d	< 0.01	0.06	0.49
Proportion of intake at night	0.17 ± 0.00	0.17 ± 0.00	0.18 ± 0.01	0.17 ± 0.01	0.17 ± 0.01	0.25	0.12	0.32
Lowest probability to start eating	0.18 ± 0.01^a	0.17 ± 0.01^bc	0.17 ± 0.01^ab	0.15 ± 0.01^cd	0.14 ± 0.01^d	< 0.01	0.00	0.53
Highest probability to start eating	0.63 ± 0.02^a	0.65 ± 0.01^b	0.68 ± 0.01^bc	0.69 ± 0.01^cd	0.72 ± 0.01^d	< 0.01	0.11	0.44

The P-value reflects whether the feature differed between periods, and if so the superscripts (a, b, c and d) show which periods differed. For each feature, the intraclass correlation coefficient (ICC) is given for both pens and pigs, reflecting which part of the variation in the feature is explained by a pen resp. pig effect. Higher values for the ICC indicate more variation explained by the pen or pig effect, meaning that for low ICCs pens/pigs differed more from each other and were more consistent across time than for high ICCs. Note that for the width of the highest peak higher numbers reflect narrower peaks and vice versa.

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