condition mean min max ZT0-3 219.6411111 219.6411111 219.6411111 ZT4-7 220.74222223333334 220.74222223333334 220.74222223333334 ZT8-11 199.8188889 199.8188889 199.8188889 ZT12-15 163.9622222 163.9622222 163.9622222 ZT16-19 185.0188889 185.0188889 185.0188889 ZT20-23 222.6711111 222.6711111 222.6711111