condition mean min max ZT0-3 449.5 449.5 449.5 ZT4-7 439.4 439.4 439.4 ZT8-11 446.1 446.1 446.1 ZT12-15 450.2 450.2 450.2 ZT16-19 551.3 551.3 551.3 ZT20-23 513.85 513.85 513.85