condition mean min max ZT0-3 6.2269575 5.86155 6.592365 ZT4-7 11.56395 11.56395 11.56395 ZT8-11 5.127325 5.127325 5.127325 ZT12-15 0 0 0 ZT16-19 9.68525 9.68525 9.68525 ZT20-23 25.082 25.082 25.082