condition mean min max ZT0-3 7.15419 7.15419 7.15419 ZT4-7 5.75952 5.75952 5.75952 ZT8-11 6.890045000000001 6.890045000000001 6.890045000000001 ZT12-15 9.05232 9.05232 9.05232 ZT16-19 11.1525 11.1525 11.1525 ZT20-23 10.103810000000001 10.103810000000001 10.103810000000001