condition mean min max ZT0-3 22.092 22.092 22.092 ZT4-7 25.46445 25.46445 25.46445 ZT8-11 22.84245 22.84245 22.84245 ZT12-15 16.966949999999997 16.966949999999997 16.966949999999997 ZT16-19 19.11485 19.11485 19.11485 ZT20-23 23.4602 23.4602 23.4602