condition mean min max ZT0-3 237.920203 237.920203 237.920203 ZT4-7 233.3236685 233.3236685 233.3236685 ZT8-11 331.353348 331.353348 331.353348 ZT12-15 536.669561 536.669561 536.669561 ZT16-19 313.866919 313.866919 313.866919 ZT20-23 364.9387775 364.9387775 364.9387775