condition mean min max ZT0-3 454.25 454.25 454.25 ZT4-7 245.1 245.1 245.1 ZT8-11 189.0 189.0 189.0 ZT12-15 299.8 299.8 299.8 ZT16-19 320.79999999999995 320.79999999999995 320.79999999999995 ZT20-23 439.25 439.25 439.25