condition mean min max ZT0-3 1539.347349 1539.347349 1539.347349 ZT4-7 343.3039565 343.3039565 343.3039565 ZT8-11 361.2829835 361.2829835 361.2829835 ZT12-15 711.174937 711.174937 711.174937 ZT16-19 2529.4721329999998 2529.4721329999998 2529.4721329999998 ZT20-23 2618.623028 2618.623028 2618.623028