condition mean min max ZT0-3 11.743138 11.743138 11.743138 ZT4-7 11.629771 11.629771 11.629771 ZT8-11 10.4119365 10.4119365 10.4119365 ZT12-15 9.602440999999999 9.602440999999999 9.602440999999999 ZT16-19 11.199176999999999 11.199176999999999 11.199176999999999 ZT20-23 10.8608115 10.8608115 10.8608115