Characteristic | Inactive co-twins, mean (SD) |
Active co-twins, mean (SD) |
Mean ifference (95% CI) |
p value* |
---|---|---|---|---|
LVM |
130.5 (44.5) | 147.7 (56.3) | -17.2 (-51.4 to 16.9) | .28 |
LVM/BSA |
67.1 (19.2) | 77.9 (22.4) | -10.8 (-26.3 to 4.8) | .15 |
LVM/body height |
74.7 (22.7) | 84.9 (28.8) | -10.2 (-29.0 to 8.6) | .25 |
LVM/body weight |
1.7 (.5) | 2.0 (.5) | -.3 (-.7 to .0) | .08 |
LVEDD |
58.8 (8.2) | 59.4 (10.1) | -.6 (-7.9 to 6.7) | .85 |
LVEDD/BSA |
30.5 (3.0) | 31.9 (3.2) | -1.4 (-4.5 to 1.7) | .33 |
EF |
56.8 (9.8) | 62.9 (10.4) | -6.1 (-13.5 to 1.3) | .10 |
Resting heart rate (bpm) | 68.0 (10.2) | 59.2 (5.1) | 8.8 (1.3 to 16.4) | .03 |
RR interval (ms) | 902.3 (134.1) | 1011.7 (80.1) | -109.4 (-216.4 to -2.3) | .05 |
P duration (ms) | 91.8 (15.8) | 103.8 (12.1) | -12.0 (-27.8 to 3.8) | .12 |
PR interval (ms) | 157.5 (21.9) | 166.7 (26.7) | -9.2 (-21.2 to 2.8) | .12 |
QRS duration (ms) | 88.8 (10.5) | 89.2 (14.0) | -.4 (-9.5 to 8.8) | .94 |
QT interval (ms) | 400.7 (25.6) | 422.0 (18.2) | -21.3 (-39.2 to -3.5) | .02 |
QTc (ms) | 423.8 (25.9) | 417.3 (15.8) | 6.5 (-9.1 to 21.9) | .38 |
Sokolow Lyon voltage (mV) | 2.7 (.7) | 2.9 (.9) | -.2 (-1.0 to .7) | .88 |
Cornell voltage (mV) | 1.2 (.5) | 1.5 (.6) | -.3 (-.7 to .2) | .22 |
Cornell product (mV x ms) | 110.5 (42.0) | 136.7 (67.7) | -26.2 (-64.8 to 12.6) | .17 |
P axis (degree) | 49.3 (18.3) | 45.9 (16.4) | 3.4 (-7.0 to 13.8) | .49 |
QRS axis (degree) | 32.0 (20.2) | 40.3 (22.9) | -8.3 (-31.7 to 15.0) | .45 |
T axis (degree) | 37.8 (13.6) | 39.8 (14.3) | -2.0 (-15.1 to 11.1) | .74 |
T wave amplitude in lead V1 (mV) | .08 (.20) | .11 (.12) | -.03 (-.20 to .15) | .75 |
T wave amplitude in lead V5 (mV) | .42 (.13) | .46 (.20) | -.04 (-.13 to .06) | .42 |
T wave amplitude in lead II (mV) | .26 (.06) | .30 (.09) | -.04 (-.09 to .01) | .08 |
LVM(g) | 153.0 (34.9) | 186.6 (38.5) | -33.6 (-70.0 to 2.9) | .06 |
LVM/BSA (g·m-2) | 77.1 (12.3) | 93.2 (12.4) | -16.1 (-33.2 to .8) | .06 |
LVM/body height (g·m-1) | 86.0 (15.8) | 104.2 (18.4) | -18.2 (-40.0 to 3.5) | .08 |
LVM/body weight (g·kg-1) | 1.9 (.3) | 2.3 (.2) | -.4 (-.8 to .0) | .04 |
LVEDD (mm) | 63.2 (9.5) | 63.6 (6.3) | -.4 (-9.5 to 8.8) | .92 |
LVEDD/BSA (mm·m-2) | 32.0 (2.9) | 32.1 (1.1) | -.1 (-3.4 to 3.2) | .96 |
EF (%) | 59.1 (11.6) | 62.6 (12.6) | -3.5 (-17.9 to 10.8) | .53 |
Resting heart rate (bpm) | 69.6 (5.1) | 60.0 (6.9) | 9.6 (-4.2 to 23.4) | .13 |
RR interval (ms) | 858.8 (83.4) | 997.6 (102.5) | -138.8 (-363.0 to 85.4) | .16 |
P duration (ms) | 86.4 (19.7) | 110.8 (13.0) | -24.4 (-60.4 to 11.6) | .13 |
PR interval (ms) | 158.4 (26.2) | 167.6 (27.8) | -9.2 (-31.5 to 13.1) | .32 |
QRS duration (ms) | 90.8 (16.0) | 88.4 (13.7) | 2.4 (-13.6 to 18.4) | .70 |
QT interval (ms) | 394.8 (25.3) | 424.4 (24.6) | -29.6 (-44.6 to -14.6) | .005 |
QTc (ms) | 424.4 (33.2) | 422.0 (19.6) | 2.4 (-35.4 to 40.2) | .87 |
Sokolow Lyon voltage (mV) | 2.8 (.7) | 2.9 (.6) | -.1 (-1.3 to 1.1) | .89 |
Cornell voltage (mV) | 1.1 (.5) | 1.5 (.7) | -.4 (-1.4 to .6) | .32 |
Cornell product (mV x ms) | 102.0 (44.9) | 141.0 (75.2) | -39.0 (-126.5 to 48.6) | .29 |
P axis (degree) | 49.6 (5.5) | 39.6 (14.1) | 10.0 (-2.3 to 22.3) | .09 |
QRS axis (degree) | 34.8 (6.6) | 36.2 (25.5) | -1.4 (-28.3 to 25.5) | .89 |
T axis (degree) | 42.8 (15.6) | 39.2 (3.7) | 3.6 (-15.1 to 22.3) | .62 |
T wave amplitude in lead V1 (mV) | .10 (.27) | .12 (.14) | -.02 (-.42 to .39) | .93 |
T wave amplitude in lead V5 (mV) | .37 (.16) | .37 (.15) | .00 (-.17 to .17) | 1.00 |
T wave amplitude in lead II (mV) | .23 (.07) | .27 (.07) | -.04 (-.12 to .04) | .21 |
LVM |
108.0 (44.4) | 108.9 (43.3) | -.9 (-75.5 to 73.7) | .98 |
LVM/BSA |
57.2 (20.7) | 62.6 (19.8) | -5.4 (-40.6 to 29.8) | .69 |
LVM/body height |
63.4 (24.3) | 65.5 (24.2) | -2.1 (-43.1 to 38.8) | .89 |
LVM/body weight |
1.4 (.5) | 1.7 (.4) | -.3 (-1.1 to .6) | .49 |
LVEDD |
55.2 (5.2) | 56.0 (11.9) | -.8 (-15.4 to 13.8) | .89 |
LVEDD/BSA |
29.3 (2.8) | 31.9 (4.4) | -2.6 (-8.7 to 3.5) | .33 |
EF |
54.9 (8.7) | 63.1 (9.5) | -8.2 (-19.8 to 3.4) | .13 |
Resting heart rate (bpm) | 66.9 (13.0) | 58.6 (4.0) | 8.3 (-4.0 to 20.6) | .15 |
RR interval (ms) | 933.4 (160.1) | 1021.7 (67.0) | -88.3 (-245.9 to 69.3) | .22 |
P duration (ms) | 95.7 (12.5) | 98.9 (9.3) | -3.2 (-20.7 to 14.4) | .68 |
PR interval (ms) | 156.9 (20.5) | 166.0 (28.1) | -9.1 (-28.6 to 10.3) | .29 |
QRS duration (ms) | 87.4 (4.9) | 89.7 (15.3) | -2.3 (-17.1 to 12.6) | .72 |
QT interval (ms) | 404.9 (26.9) | 420.3 (14.0) | -15.4 (-48.1 to 17.3) | .29 |
QTc (ms) | 423.3 (22.2) | 414.0 (13.0) | 9.3 (-10.4 to 28.9) | .29 |
Sokolow Lyon voltage (mV) | 2.7 (.7) | 2.9 (1.1) | -.2 (-1.6 to 1.3) | .87 |
Cornell voltage (mV) | 1.3 (.5) | 1.5 (.6) | -.2 (-.6 to .4) | .56 |
Cornell product (mV x ms) | 116.6 (42.2) | 133.6 (67.9) | -17.0 (-69.7 to 35.7) | .46 |
P axis (degree) | 49.1 (24.4) | 50.4 (17.4) | -1.3 (-18.9 to 16.4) | .86 |
QRS axis (degree) | 30.0 (26.6) | 43.3 (22.5) | -13.3 (-55.7 to 29.1) | .47 |
T axis (degree) | 34.1 (11.9) | 40.1 (19.1) | -6.0 (-28.5 to 16.5) | .54 |
T wave amplitude in lead V1 (mV) | .07 (.16) | .10 (.12) | -.03 (-.27 to .20) | .74 |
T wave amplitude in lead V5 (mV) | .45 (.10) | .52 (.22) | -.07 (-.21 to .09) | .35 |
T wave amplitude in lead II (mV) | .27 (.05) | .32 (.10) | -.05 (-.13 to .04) | .25 |