condition mean min max ZT0-3 4.966585 4.966585 4.966585 ZT4-7 4.23659 4.23659 4.23659 ZT8-11 4.92098 4.92098 4.92098 ZT12-15 6.299155000000001 6.299155000000001 6.299155000000001 ZT16-19 5.95381 5.95381 5.95381 ZT20-23 4.967594999999999 4.967594999999999 4.967594999999999