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Official Journal of the Japan Wood Research Society

Table 4 Tukey’s test on investigated color parameters of densified beech (Fagus sylvatica L.) and Norway spruce (Picea abies L. Karst) veneer samples. (a* red/green coordinates; b* yellow/blue coordinates; C* color saturation; h° hue angle; L* lightness.)

From: Effects of an innovative densification process on mechanical and physical properties of beech and Norway spruce veneers

Species Color parameter Treatment intensity Mean difference 95% confidence interval P value
Lower bound Upper bound
Norway spruce a* 60 s–control 1.1802 0.5492825 1.8111175  < 0.05
90 s–control 1.4130 0.7820825 2.0439175  < 0.05
300 s–control 1.6974 1.0664825 2.3283175  < 0.05
480 s–control 1.6290 0.9980825 2.2599175  < 0.05
90–60 s 0.2328 − 0.3981175 0.8637175 0.83
300–60 s 0.5172 − 0.1137175 1.1481175 0.15
480 s–60 s 0.4488 − 0.1821175 1.0797175 0.27
300 s–90 s 0.2844 − 0.3465175 0.9153175 0.70
480 s–90 s 0.2160 − 0.4149175 0.8469175 0.86
480 s–300 s − 0.0684 − 0.6993175 0.5625175 0.10
b* 60 s–control 13.3254 11.7943145 14.8564855  < 0.05
90 s–control 14.6836 13.1525145 16.2146855  < 0.05
300 s–control 13.3658 11.8347145 14.8968855  < 0.05
480 s–control 12.1444 10.6133145 13.6754855  < 0.05
90 s–60 s 1.3582 − 0.1728855 2.8892855 0.10
300 s–60 s 0.0404 − 1.4906855 1.5714855 0.10
480 s–60 s − 1.1810 − 2.7120855 0.3500855 0.20
300 s–90 s − 1.3178 − 2.8488855 0.2132855 0.12
480 s–90 s − 2.5392 − 4.0702855 − 1.0081145  < 0.05
480 s–300 s − 1.2214 − 2.7524855 0.3096855 0.17
C* 60 s–control 13.3683 11.7921259 14.9444741  < 0.05
90 s–control 14.7449 13.1687259 16.3210741  < 0.05
300 s–control 13.4749 11.8987259 15.0510741  < 0.05
480 s–control 12.2549 10.6787259 13.8310741  < 0.05
90 s–60 s 1.3766 − 0.1995741 2.9527741 0.11
300 s–60 s 0.1066 − 1.4695741 1.6827741 0.10
480 s–60 s − 1.1134 − 2.6895741 0.4627741 0.28
300 s–90 s − 1.2700 − 2.8461741 0.3061741 0.17
480 s–90 s − 2.4900 − 4.0661741 − 0.9138259  < 0.05
480 s–300 s − 1.2200 − 2.7961741 0.3561741 0.20
h° 60 s–control 0.0189 0.003867921 0.033932079  < 0.05
90 s–control 0.0177 0.002667921 0.032732079  < 0.05
300 s–control 0.0047 − 0.010332079 0.019732079 0.90
480 s–control 0.0018 − 0.013232079 0.016832079 0.10
90 s–60 s − 0.0012 − 0.016232079 0.013832079 0.10
300 s–60 s − 0.0142 − 0.029232079 0.000832079 0.07
480 s–60 s − 0.0171 − 0.032132079 –0.002067921 0.02
300 s–90 s − 0.0130 − 0.028032079 0.002032079 0.12
480 s–90 s − 0.0159 − 0.030932079 − 0.000867921 0.04
480 s–300 s − 0.0029 − 0.017932079 0.012132079 0.98
L* 60 s–control − 14.9360 − 16.186056 − 13.6859439  < 0.05
90 s–control − 15.0588 − 16.308856 − 13.8087439  < 0.05
300 s–control − 16.6676 − 17.917656 − 15.4175439  < 0.05
480 s–control − 17.1688 − 18.418856 15.9187439  < 0.05
90 s–60 s − 0.1228 − 1.372856 1.1272561 0.10
300 s–60 s − 1.7316 − 2.981656 − 0.4815439  < 0.05
480 s–60 s − 2.2328 − 3.482856 − 0.9827439  < 0.05
300 s–90 s − 1.6088 − 2.858856 − 0.3587439  < 0.05
480 s–90 s − 2.1100 − 3.360056 − 0.8599439  < 0.05
480 s–300 s − 0.5012 − 1.751256 0.7488561 0.78
Beech a* 60 s–control 0.9304 − 0.7820142 2.6428142 0.47
90 s–control 2.3910 0.6785858 4.1034142  < 0.05
300 s–control − 1.5840 − 3.2964142 0.1284142 0.08
90 s–60 s 1.4606 − 0.2518142 3.1730142 0.12
300 s–60 s − 2.5144 − 4.2268142 − 0.8019858  < 0.05
300 s–90 s − 3.9750 − 5.6874142 − 2.2625858  < 0.05
b* 60 s–control 4.9954 3.5408862 6.449914  < 0.05
90 s–control 2.3174 0.8628862 3.771914  < 0.05
300 s–control 5.2962 3.8416862 6.750714  < 0.05
90 s–60 s − 2.6780 − 4.1325138 − 1.223486  < 0.05
300 s–60 s 0.3008 − 1.1537138 1.755314 0.94
300 s–90 s 2.9788 1.5242862 4.433314  < 0.05
C* 60 s–control 5.1136 3.8357453 6.3914547  < 0.05
90 s–control 3.0410 1.7631453 4.3188547  < 0.05
300 s–control 4.7631 3.4852453 6.0409547  < 0.05
90 s–60 s − 2.0726 − 3.3504547 − 0.7947453  < 0.05
300 s–60 s − 0.3505 − 1.6283547 0.9273547 0.88
300 s–90 s 1.7221 0.4442453 2.9999547  < 0.05
h° 60 s–control 0.0196 − 0.04487028 0.084070281 0.84
90 s–control − 0.0584 − 0.12287028 0.006070281 0.09
300 s–control 0.1040 0.03952972 0.168470281  < 0.05
90 s–60 s − 0.0780 − 0.14247028 − 0.013529719  < 0.05
300 s–60 s 0.0844 0.01992972 0.148870281  < 0.05
300 s–90 s 0.1624 0.09792972 0.226870281  < 0.05
L* 60 s–control − 15.2126 − 17.2571171 − 13.16808287  < 0.05
90 s–control − 17.2420 − 19.2865171 − 15.19748287  < 0.05
300 s–control − 14.6800 − 16.7245171 − 12.63548287  < 0.05
90 s–60 s − 2.0294 − 4.0739171 0.01511713 0.05
300 s–60 s 0.5326 − 1.5119171 2.57711713 0.89
300 s–90 s 2.5620 0.5174829 4.60651713  < 0.05