condition mean min max ZT0-3 4.17365 4.17365 4.17365 ZT4-7 3.186315 3.186315 3.186315 ZT8-11 3.76952 3.76952 3.76952 ZT12-15 4.05595 4.05595 4.05595 ZT16-19 6.441255 6.441255 6.441255 ZT20-23 4.744260000000001 4.744260000000001 4.744260000000001