condition mean min max ZT0-3 7.14 7.14 7.14 ZT4-7 7.45 7.45 7.45 ZT8-11 14.431111111 14.431111111 14.431111111 ZT12-15 9.25111111 9.25111111 9.25111111 ZT16-19 9.96222222 9.96222222 9.96222222 ZT20-23 7.002222222333334 7.002222222333334 7.002222222333334