condition mean min max ZT0-3 9.25385 9.25385 9.25385 ZT4-7 9.3599705 9.3599705 9.3599705 ZT8-11 10.729263 10.729263 10.729263 ZT12-15 9.7843345 9.7843345 9.7843345 ZT16-19 9.1725105 9.1725105 9.1725105 ZT20-23 8.8783315 8.8783315 8.8783315