Table 1.

Mean motor development scores* corresponding with cannabis exposure during gestation and lactation [23].

	Motor Development PDI
Days of infant Cannabis exposure	Mean
Trimester one
0	105 (n = 84)
1 to 44	99 (n = 36)
45 to 90	93 (n = 16)
Trimester two
0	102 (n = 98)
1 to 44	104 (n = 25)
45 to 90	94 (n = 13)
Trimester three
0	101 (n = 94)
1 to 44	107 (n = 28)
45 to 90	94 (n = 14)
Lactation month one
0	102 (n = 81)
1 to 44	106 (n = 38)
45 to 90	90 (n = 17)
Lactation month three
0	102 (n = 84)
1 to 44	103 (n = 28)
45 to 90	97 (n = 13)

*Motor developmental scores (Psychomotor Development Index, PDI) were from Bayley Scales of Infant Development. During the first trimester, PDI decreased with increasing cannabis exposure (test for linear trend, P = .005). During the first lactation month, mean PDI for the higher exposure group was lower than the PDI for the no or low exposure groups (one-way ANOVA P = .008).