Exact(4)
By two-tailed t-test, all markers exhibited highly significant (P<0.0001) decrements in immunoreactivity in the AD twin compared to the ND twin (Figure 2b).
Certain maternal or pregnancy-related factors associated with twinning may however be related to a reduced risk (Risch, 1998) though only a slightly lower or similar risk has been reported in twin compared to singleton mothers (Wyshak et al, 1983; Olsen and Storm, 1998; Lambe et al, 1999; Whiteman et al, 2000; Titus-Ernstoff et al, 2001; Neale et al, 2004, 2005).
Previous studies have found a lower or rather similar risk of epithelial ovarian cancer in twin compared to singleton mothers (Olsen and Storm, 1998; Lambe et al, 1999; Whiteman et al, 2000; Titus-Ernstoff et al, 2001; Neale et al, 2004, 2005), but few have focused on sex of the twins, or performed subgroup analyses.
In a twin study where only one twin was affected by TS, lower birth weight was noted in the TS twin compared to their disconcordant twin without TS (TS twins: 2228 ± 244 gm vs. Twins without TS: 2545 ± 216 gm, paired t test, p = 0.006) [ 16].
Similar(56)
The sialyltransferase gene ST6GALNAC1 promoter region was significantly hypomethylated in psychosis-associated twins compared to healthy twins17.
Consistent with familial influences, activity in the anterior cingulate and insula was significantly reduced in both the twins with ADHD and their co-twins compared to the unrelated controls.
Since identical twins have the same genes, while fraternal twins share only 50% of theirs, a consistently greater difference in subject choice or achievement between fraternal twins compared to identical ones would suggest that genetics played a significant role in such traits.
Similarly, a follow up study by the same group showed that plasmalogens containing arachidonic acid at the sn-2 position are reduced in the adipocyte membranes of morbidly obese twins compared to metabolically healthy twins (Pietiläinen et al., 2011).
In May 2006, an article in the Journal of Reproductive Medicine concluded that rbGH use, and the subsequent increase in IGF-1 in the US diet, is probably the reason why we have much higher levels of fraternal twins compared to the UK, where rbGH is banned.
A similar pattern was observed for deceleration time, which was prolonged for movements towards the co-twin compared to movements towards the eye or the mouth region.
Mean developmental score seems lower in uncomplicated MC twins compared to DC twins (103 vs 106, p = 0.109).
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