condition mean min max ZT0-3 1.683343 0.49355899999999997 2.48934 ZT4-7 0.7278910000000001 0.7278910000000001 0.7278910000000001 ZT8-11 0.5887895 0.5887895 0.5887895 ZT12-15 0.49369925 0.3255985 0.6617999999999999 ZT16-19 1.1306935 1.1306935 1.1306935 ZT20-23 2.068345 2.068345 2.068345