condition mean min max ZT0-3 261.577998 261.577998 261.577998 ZT4-7 262.54278550000004 262.54278550000004 262.54278550000004 ZT8-11 358.237636 358.237636 358.237636 ZT12-15 418.641324 418.641324 418.641324 ZT16-19 585.6855895 585.6855895 585.6855895 ZT20-23 591.2934965 591.2934965 591.2934965