condition mean min max ZT0-3 5.682395 5.682395 5.682395 ZT4-7 4.21 4.21 4.21 ZT8-11 4.70932 4.70932 4.70932 ZT12-15 4.890465 4.890465 4.890465 ZT16-19 6.16035 6.16035 6.16035 ZT20-23 6.13225 6.13225 6.13225