condition mean min max ZT0-3 161.360566 161.360566 161.360566 ZT4-7 166.590595 166.590595 166.590595 ZT8-11 225.9712705 225.9712705 225.9712705 ZT12-15 192.9972555 192.9972555 192.9972555 ZT16-19 200.940342 200.940342 200.940342 ZT20-23 195.154728 195.154728 195.154728