condition mean min max ZT0-3 24.25725 24.25725 24.25725 ZT4-7 20.0667 20.0667 20.0667 ZT8-11 19.7621 19.7621 19.7621 ZT12-15 17.1346 17.1346 17.1346 ZT16-19 23.6331 23.6331 23.6331 ZT20-23 24.319699999999997 24.319699999999997 24.319699999999997