condition mean min max ZT0-3 21.326217 21.326217 21.326217 ZT4-7 32.1231225 32.1231225 32.1231225 ZT8-11 24.4414145 24.4414145 24.4414145 ZT12-15 24.564297 24.564297 24.564297 ZT16-19 24.7959335 24.7959335 24.7959335 ZT20-23 23.4442285 23.4442285 23.4442285