Table 2.

Maximal tetanic force in absolute (g) and specific (g/cm²) values of the extensor digitorum longus (EDL) and soleus (SO) muscles. Maximal tetanic force in mice with normal or deficient vitamin D levels, breathing room air (air) or exposed to cigarette smoke (smoking) during 6, 12, and 18 weeks. Values are expressed as mean±s.d.

	Air				Smoking				Interaction term
	Normal		Deficient		Normal		Deficient
	Absolute	Specific	Absolute	Specific	Absolute	Specific	Absolute	Specific
6 weeks
EDL	37±5	4156±773	37±4	3748±597	35±6	4252±819	41±3	4520±374
SO	21±3	2769±533	24±5	2567±735	22±4	2778±524	24±5	2877±508
12 weeks
EDL	38±8	4609±907	33±6	3393±757a	35±5	4303±479	38±4	4182±740a	c
SO	28±3	3742±348	26±5	2850±494b	25±4	3654±512	25±6	3095±759b
18 weeks
EDL	43±4	4926±353	30±9b	2967±929b	38±3	4618±596	30±10b	3216±1175b
SO	25±3	3111±505	21±8	2124±782a	24±4	3183±486	22±7	2595±822a

^aP<0.01 and ^bP<0.0001 effect of vitamin D deficiency. Interaction term between vitamin D deficiency and smoking (^cP=0.0249).