condition mean min max ZT0-3 5.9771849999999995 4.994495000000001 6.84662 ZT4-7 3.4378900000000003 3.4378900000000003 3.4378900000000003 ZT8-11 3.596405 3.596405 3.596405 ZT12-15 5.199960000000001 5.121085 5.278835000000001 ZT16-19 5.588025 5.588025 5.588025 ZT20-23 8.00516 8.00516 8.00516