condition mean min max ZT0-3 10.0599325 10.03518 10.084685 ZT4-7 8.731045 8.731045 8.731045 ZT8-11 9.765654999999999 9.765654999999999 9.765654999999999 ZT12-15 0 0 0 ZT16-19 11.7419 11.7419 11.7419 ZT20-23 10.42225 10.42225 10.42225