condition mean min max ZT0-3 11.230008 11.230008 11.230008 ZT4-7 10.273121 10.273121 10.273121 ZT8-11 14.834869000000001 14.834869000000001 14.834869000000001 ZT12-15 10.308119 10.308119 10.308119 ZT16-19 19.809343 19.809343 19.809343 ZT20-23 18.199469 18.199469 18.199469