condition mean min max ZT0-3 363.255856 363.255856 363.255856 ZT4-7 442.4328995 442.4328995 442.4328995 ZT8-11 391.7209425 391.7209425 391.7209425 ZT12-15 380.345572 380.345572 380.345572 ZT16-19 567.4170025 567.4170025 567.4170025 ZT20-23 599.365918 599.365918 599.365918