Table 1. Shown are the average duration and root-mean square jitter (standard deviation) of each measure of respiratory/vocal coordination.

Feature	Average Duration (ms)	Absolute Jitter (ms)	Fractional Jitter (c.v. %)
IP	35.2±2.4	1.90±0.24	5.6±0.6
EP	126±12.8	2.68±0.24	2.4±0.3
Gap	50.4±3.2	2.80±0.30	5.6±0.5
Syllable	107±13.7	3.03±0.30	3.8±0.7
IP onset period	4.24±1.7	1.32±0.14	−8.2±20.6
IP offset period	11.2±1.4	1.13±0.12	40.0±29.0
IP onset to next syllable onset	46.4±2.6	2.4±0.28	5.3±0.6
Syllable offset to IP offset	39.6±2.7	2.9±0.45	7.5±1.2
Syllable onset to next IP onset	110±13.4	2.8±0.25	3.4±0.6

Both absolute jitter (ms) and fractional jitter (% c.v.) are shown. Error bars indicate s.e.m for each quantity. IP onset period is the period from the end of each syllable to the onset of the following IP. IP offset period is the period from the offset of the IP to the onset of the following syllable. The last item (syllable onset to next IP onset) is the quantity shown in yellow in Figure 7G. Note that the average IP onset and IP offset periods are very short. In fact, for some gaps the IP onset period is negative, meaning that the syllable extends slightly into the IP. Because of this, the measure of fractional jitter (text in bold) is highly unreliable and should not be considered.