condition mean min max ZT0-3 9.17894 9.17894 9.17894 ZT4-7 6.50924 6.50924 6.50924 ZT8-11 7.281275000000001 7.281275000000001 7.281275000000001 ZT12-15 7.274585 7.274585 7.274585 ZT16-19 12.3707 12.3707 12.3707 ZT20-23 10.218620000000001 10.218620000000001 10.218620000000001